Year	Percent
1983	13.40118
1984	14.62803
1985	13.59511
1986	12.65182
1987	13.71186
1988	12.34948
1989	11.54867
1990	9.20846
1991	8.49783
1992	8.81564
1993	7.36676
1994	7.92534
1995	8.61611
1996	8.01606
1997	6.55147
1998	6.82374
1999	5.81525
2000	5.99419
2001	5.5867
2002	7.52966
2003	9.63878
2004	10.99679
2005	8.74584
2006	8.91385
2007	8.49936
2008	9.16892
2009	7.887
2010	7.20206
2011	8.82916
2012	8.12177
2013	7.6162
2014	6.73546
2015	6.13144
2016	6.67872
2017	5.30924
2018	5.7188
2019	6.55671
2020	6.49143
2021	8.12893
2022	7.27128