Year	Percent
1983	24.10492
1984	23.4561
1985	23.76764
1986	24.25344
1987	23.32695
1988	24.12159
1989	23.42553
1990	21.54872
1991	19.66181
1992	19.52141
1993	17.87984
1994	17.28626
1995	17.13835
1996	16.67239
1997	16.09211
1998	18.08285
1999	19.61268
2000	15.6787
2001	15.99492
2002	16.31967
2003	15.18535
2004	14.33578
2005	13.12662
2006	12.9738
2007	13.71668
2008	14.48174
2009	15.29015
2010	13.92921
2011	13.51229
2012	13.37397
2013	13.3567
2014	13.33675
2015	13.49264
2016	13.47875
2017	13.15663
2018	12.8085
2019	12.7126
2020	13.69841
2021	13.28022
2022	12.39966