| Year | Grassland butterflies (17 species) | Lower confidence limits | Upper confidence limits | Trend line | Coverage |
|---|---|---|---|---|---|
| 1990 | 108.79 | 73.73 | 135.7 | 100 | EU |
| 1991 | 87.68 | 74.48 | 119.16 | 94.48 | EU |
| 1992 | 96.43 | 74.48 | 108.9 | 90.02 | EU |
| 1993 | 76.83 | 73.73 | 101.54 | 86.4 | EU |
| 1994 | 80.86 | 72.27 | 96.59 | 83.59 | EU |
| 1995 | 79.43 | 70.14 | 94.68 | 81.46 | EU |
| 1996 | 83.39 | 68.75 | 92.8 | 79.84 | EU |
| 1997 | 77.66 | 68.07 | 91.88 | 79.1 | EU |
| 1998 | 80.91 | 67.39 | 92.8 | 79.18 | EU |
| 1999 | 69.32 | 67.39 | 93.73 | 79.29 | EU |
| 2000 | 99 | 68.07 | 92.8 | 79.72 | EU |
| 2001 | 68.97 | 68.75 | 93.73 | 80.53 | EU |
| 2002 | 82.34 | 68.75 | 94.68 | 80.51 | EU |
| 2003 | 79.54 | 68.07 | 91.88 | 78.94 | EU |
| 2004 | 79.71 | 66.72 | 90.06 | 77.24 | EU |
| 2005 | 84.38 | 65.4 | 87.4 | 75.52 | EU |
| 2006 | 72.51 | 64.1 | 85.67 | 73.84 | EU |
| 2007 | 72.97 | 63.46 | 83.97 | 73.03 | EU |
| 2008 | 54.54 | 63.46 | 82.31 | 72.46 | EU |
| 2009 | 71.38 | 63.46 | 81.49 | 71.76 | EU |
| 2010 | 84.79 | 62.83 | 79.88 | 70.89 | EU |
| 2011 | 79.11 | 62.83 | 78.29 | 70.03 | EU |
| 2012 | 58.16 | 62.83 | 76.74 | 69.14 | EU |
| 2013 | 74.78 | 62.21 | 75.22 | 68.19 | EU |
| 2014 | 79.28 | 60.37 | 74.48 | 67.21 | EU |
| 2015 | 56.02 | 58 | 75.98 | 66.2 | EU |
| 1990 | 108.93 | 71.53 | 139.78 | 100 | Europe |
| 1991 | 88.92 | 73.7 | 122.74 | 94.69 | Europe |
| 1992 | 95.37 | 73.7 | 109.95 | 90.38 | Europe |
| 1993 | 77.27 | 72.97 | 103.55 | 86.85 | Europe |
| 1994 | 80.83 | 71.53 | 99.49 | 84.09 | Europe |
| 1995 | 80.45 | 69.41 | 97.52 | 81.98 | Europe |
| 1996 | 84 | 67.36 | 95.59 | 80.32 | Europe |
| 1997 | 76.78 | 66.69 | 94.64 | 79.53 | Europe |
| 1998 | 81.81 | 66.03 | 95.59 | 79.54 | Europe |
| 1999 | 69.13 | 66.03 | 95.59 | 79.49 | Europe |
| 2000 | 101.32 | 66.69 | 94.64 | 79.53 | Europe |
| 2001 | 68.22 | 67.36 | 94.64 | 79.79 | Europe |
| 2002 | 81.55 | 66.69 | 94.64 | 79.38 | Europe |
| 2003 | 76.92 | 66.03 | 90.93 | 77.45 | Europe |
| 2004 | 79.17 | 64.08 | 89.13 | 75.52 | Europe |
| 2005 | 79.9 | 62.81 | 86.49 | 74.02 | Europe |
| 2006 | 72.05 | 61.56 | 85.63 | 72.63 | Europe |
| 2007 | 70.46 | 61.56 | 83.94 | 72.04 | Europe |
| 2008 | 54.14 | 62.18 | 83.1 | 71.73 | Europe |
| 2009 | 74.58 | 62.18 | 82.28 | 71.31 | Europe |
| 2010 | 87.59 | 62.18 | 80.65 | 70.74 | Europe |
| 2011 | 77.73 | 62.18 | 79.84 | 70.24 | Europe |
| 2012 | 57.47 | 62.18 | 78.26 | 69.72 | Europe |
| 2013 | 74.63 | 61.56 | 77.48 | 69.16 | Europe |
| 2014 | 79.83 | 60.34 | 78.26 | 68.58 | Europe |
| 2015 | 58.86 | 57.98 | 79.84 | 68 | Europe |
| 1990 | 102.2 | 70.03 | 142.43 | 100 | Pan-Europe |
| 1991 | 86.68 | 72.16 | 123.83 | 94.36 | Pan-Europe |
| 1992 | 101.71 | 72.88 | 110.93 | 89.77 | Pan-Europe |
| 1993 | 83.5 | 71.44 | 103.43 | 86.04 | Pan-Europe |
| 1994 | 81.53 | 69.33 | 99.37 | 83.12 | Pan-Europe |
| 1995 | 79.29 | 67.28 | 97.4 | 80.93 | Pan-Europe |
| 1996 | 79 | 65.29 | 95.48 | 79.27 | Pan-Europe |
| 1997 | 72.7 | 64.64 | 94.53 | 78.34 | Pan-Europe |
| 1998 | 79.24 | 64 | 95.48 | 78.12 | Pan-Europe |
| 1999 | 68.88 | 64 | 95.48 | 78.2 | Pan-Europe |
| 2000 | 101.86 | 65.29 | 96.44 | 79.27 | Pan-Europe |
| 2001 | 70.47 | 66.61 | 98.38 | 81.14 | Pan-Europe |
| 2002 | 82.74 | 67.28 | 100.37 | 81.95 | Pan-Europe |
| 2003 | 82.15 | 66.61 | 97.4 | 80.65 | Pan-Europe |
| 2004 | 82.5 | 65.95 | 95.48 | 79.16 | Pan-Europe |
| 2005 | 84.6 | 65.29 | 92.65 | 77.6 | Pan-Europe |
| 2006 | 74.52 | 64 | 89.92 | 76 | Pan-Europe |
| 2007 | 74.66 | 64 | 89.02 | 75.28 | Pan-Europe |
| 2008 | 55.91 | 64 | 87.26 | 74.74 | Pan-Europe |
| 2009 | 76.09 | 64 | 86.39 | 74.1 | Pan-Europe |
| 2010 | 90.02 | 63.36 | 84.68 | 73.34 | Pan-Europe |
| 2011 | 79.72 | 63.36 | 83 | 72.59 | Pan-Europe |
| 2012 | 60.11 | 63.36 | 81.36 | 71.81 | Pan-Europe |
| 2013 | 76.56 | 62.73 | 80.55 | 71 | Pan-Europe |
| 2014 | 80.73 | 60.88 | 80.55 | 70.16 | Pan-Europe |
| 2015 | 60.58 | 58.49 | 82.18 | 69.3 | Pan-Europe |