Year	Percent
1990	72.574
1991	72.402
1992	72.179
1993	71.914
1994	71.652
1995	71.483
1996	71.506
1997	71.652
1998	72.947
1999	72.168
2000	71.657
2001	72.444
2002	73.049
2003	71.541
2004	74.37
2005	74.953
2006	74.818
2007	75.781
2008	75.726
2009	75.498
2010	75.673
2011	74.479
2012	74.269
2013	74.477
2014	74.397
2015	75.113
2016	74.256
2017	74.328
2018	74.422
2019	74.474
2020	74.443
2021	74.34
2022	74.164
2023	73.937
2024	73.699
2025	73.473
2026	73.253
2027	73.039
2028	72.838
2029	72.659
2030	72.506