Year	Percent
1992	32.41331
1993	31.13942
1994	25.97311
1995	23.37816
1996	23.70842
1997	24.13305
1998	24.60486
1999	23.61406
2000	23.2602
2001	20.99552
2002	16.47087
2003	19.54942
2004	18.1741
2005	20.80444
2006	21.19604
2007	21.57584
2008	21.39184
2009	21.9816
2010	22.38264
2011	22.31658
2012	22.55013
2013	22.19922
2014	22.40626
2015	22.84334
2016	23.07338
2017	22.97076
2018	23.04094
2019	23.12047
2020	23.04094
2021	23.08772