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	5.166612474127579
1995	5.715458875730579
1996	10.991651921186364
1997	18.344790289993668
1998	31.453513411407698
1999	27.503159343220098
2000	34.23721972425191
2001	23.69216644694987
2002	25.84874919815226
2003	18.530473153352798
2004	18.65064272748518
2005	19.982509858246175
2006	24.024985950040637
2007	30.540282243309615
2008	41.02510620411172
2009	26.615320841766767
2010	29.44260234847015
2011	28.149859855093656
2012	24.809438577969487
2013	24.452064443526
2014	26.11154384195998
2015	31.553094531245875
2016	38.072204038032694
2017	25.571535828692745
2018	41.41226517515968
2019	32.53966451915885
2020	33.9156128066923
2021	28.18200792916211
2022	25.3816915621571