Year	%
1976	3.771558342609701
1977	3.4779154446870204
1978	3.5353262792694498
1979	4.7280563579459995
1980	9.293216528685221
1981	3.47687688377699
1982	3.3319160415168
1983	4.1271731312811
1984	3.4321539122587397
1985	4.38252984066758
1986	5.05073314328639
1987	7.1325912588810505
1988	3.4911944517592994
1989	5.0875049307922
1990	6.0246124899831
1991	4.37385188357416
1992	4.41501092987446
1993	3.645623990027709
1994	5.160642661588237
1995	5.6005288827404005
1996	10.623609515022146
1997	17.560429836765483
1998	29.959997570492686
1999	26.540849499475247
2000	34.04043357042636
2001	23.560383366331962
2002	25.638852631883765
2003	18.394224580444615
2004	18.561438348529897
2005	19.48858453646499
2006	23.373591497672844
2007	29.592768693879922
2008	39.98610046239404
2009	25.592258508709378
2010	28.322315659719607
2011	27.019091340665504
2012	24.809438577969487
2013	24.452064443526
2014	24.605005488557023
2015	29.743607052680158
2016	36.176644298272414
2017	24.989020584624967
2018	40.3699780089678
2019	31.323762875759268
2020	32.358416305070946
2021	25.76942307935052
2022	23.189828478305692