Year	Percent
1983	42.15962
1995	23.9209
1996	23.37304
1997	23.10819
1998	25.25381
1999	23.64826
2000	24.07505
2001	23.04577
2002	23.22009
2003	23.17164
2004	21.95934
2005	22.42776
2006	22.33975
2007	24.98155
2008	26.20064
2009	25.03221
2010	24.746
2011	26.36572
2012	28.10718
2013	26.41154
2014	24.90263
2015	26.20168
2016	27.1669
2017	27.62992
2018	22.51219
2019	23.25449
2020	22.10163
2021	22.27563
2022	22.46853