Year	Grassland butterflies (17 species)	Trend line	lower confidence limit of the smoothed indicator	upper confidence limit of the smoothed indicator	Confidence limits
1990
1991	109.61	100.0	72.320277	151.40275	79.082473
1992	100.19	98.01	73.074929	145.38327	72.308341
1993	86.11	96.31	71.891266	139.6532	67.761934
1994	86.98	94.98	71.38882	134.55364	63.16482
1995	107.04	94.16	70.497374	131.52706	61.029686
1996	88.2	93.69	70.030061	129.08414	59.054079
1997	85.43	93.26	70.064413	125.73803	55.673617
1998	76.24	93.36	70.551859	123.93189	53.380031
1999	78.98	94.2	71.431413	123.39323	51.961817
2000	107.4	95.07	72.264019	122.95598	50.691961
2001	84.5	95.25	72.942177	122.2615	49.319323
2002	134.24	94.43	73.64103	120.56021	46.91918
2003	98.18	93.13	74.114976	119.10258	44.987604
2004	84.63	91.86	73.940127	117.23416	43.294033
2005	77.13	89.98	73.287199	114.27276	40.985561
2006	79.43	87.16	72.491151	109.45068	36.959529
2007	82.79	84.31	70.286059	104.33106	34.045001
2008	72.35	82.33	69.245079	101.28022	32.035141
2009	90.1	81.63	68.792108	99.205087	30.412979
2010	86.09	81.46	68.513689	97.548955	29.035266
2011	91.94	80.94	68.42551	95.891936	27.466426
2012	78.38	80.09	68.513661	93.727503	25.213842
2013	84.0	79.4	68.631162	91.731233	23.100071
2014	89.31	78.72	68.484372	89.630468	21.146096
2015	65.09	77.91	68.614319	87.582926	18.968607
2016	73.21	76.92	68.982904	85.30039	16.317486
2017	81.45	75.82	68.890043	83.067149	14.177106
2018	72.32	74.67	68.374078	81.909283	13.535205