Year	All common birds (168 species)	Common farmland birds (39 species)	Common forest birds (34 species)
1990	100	100	100
1991	100.16	98.71	100.49
1992	100.26	97.46	100.74
1993	100.39	96.41	100.82
1994	100.48	95.41	100.78
1995	100.49	94.36	100.64
1996	100.36	93.11	100.45
1997	99.98	91.59	99.97
1998	99.41	89.87	99.07
1999	99.34	88.06	97.96
2000	97.72	86.25	96.83
2001	96.95	84.57	95.88
2002	96.34	83.09	95.28
2003	95.83	81.73	94.93
2004	95.32	80.42	94.66
2005	94.84	79.18	94.48
2006	94.41	78.4	94.42
2007	94.06	77.06	94.52
2008	93.8	76.2	94.75
2009	93.57	75.41	95.11
2010	93.38	74.71	95.58
2011	93.24	74.09	96.17
2012	93.15	73.56	96.87
2013	93.09	73.11	97.7
2014	93.08	72.75	98.65
2015	93.13	72.48	99.74
2016	93.21	72.27	100.95
2017	93.33	72.14	102.32
2018	93.45	72.01	103.71
2019	93.57	71.88	105.12