Year	Percent
1993	45.29438
1994	45.55771
1995	47.72456
1996	44.46308
1997	44.44721
1998	44.47996
1999	40.90385
2000	35.9187
2001	34.3203
2002	31.12904
2003	31.97082
2004	29.38976
2005	30.71006
2006	30.05876
2007	29.69654
2008	32.75106
2009	33.49072
2010	33.87668
2011	34.55731
2012	33.5196
2013	31.59506
2014	28.8713
2015	26.58036
2016	24.74266
2017	23.36144
2018	22.01296
2019	20.71187
2020	22.6964
2021	22.8475
2022	22.2302