Year	Percent
1990	44.313
1991	45.03
1992	45.843
1993	46.359
1994	46.907
1995	46.848
1996	47.41
1997	48.188
1998	48.701
1999	48.708
2000	48.91
2001	48.905
2002	48.366
2003	49.205
2004	50.06
2005	49.42
2006	49.938
2007	49.018
2008	48.119
2009	48.823
2010	46.379
2011	48.102
2012	48.188
2013	47.79
2014	47.157
2015	47.453
2016	47.43
2017	47.332
2018	47.223
2019	47.111
2020	47.002
2021	46.906
2022	46.816
2023	46.73
2024	46.641
2025	46.543
2026	46.454
2027	46.361
2028	46.263
2029	46.161
2030	46.052