Year	All common birds (n=163 species)	Common forest birds (n=33 species)	Common farmland birds (n=39 species)
1990	100	100	100
1991	98.65118692	102.3602021	95.08816312
1992	96.16364626	95.6031224	94.80885518
1993	98.03021408	87.34188397	102.3329338
1994	98.68887058	95.46999676	97.0441802
1995	91.6558709	85.59255456	82.01353642
1996	91.74013225	88.43025111	78.6922028
1997	92.66982758	91.72662348	83.42709924
1998	88.73811211	82.99598873	80.79042151
1999	89.09044639	81.86492664	82.73521498
2000	87.99331403	79.88056578	79.8904623
2001	91.42431362	82.60647705	82.98070943
2002	90.01864824	84.89881255	74.17093741
2003	90.00862354	87.20753626	75.64807313
2004	93.01682984	90.47685527	78.9857481
2005	88.95856744	86.21085941	76.12509725
2006	88.7818784	85.63322411	75.03905996
2007	90.50583452	84.1198788	74.16198586
2008	90.32797134	88.08133087	73.77351474
2009	86.59894867	84.00240304	71.90375025
2010	87.34591083	85.57374492	70.5785472
2011	87.98411187	86.51181216	72.49418028
2012	88.07183698	92.19260945	70.67199034