Year	Percent
1990	77.079
1991	76.962
1992	76.525
1993	76.69
1994	76.807
1995	76.771
1996	76.831
1997	76.689
1998	75.657
1999	74.588
2000	73.482
2001	72.335
2002	71.153
2003	69.94
2004	68.709
2005	70.867
2006	72.787
2007	74.492
2008	76.002
2009	76.053
2010	75.755
2011	75.366
2012	74.299
2013	74.059
2014	74.569
2015	74.71
2016	73.98
2017	74.125
2018	74.267
2019	74.397
2020	74.508
2021	74.594
2022	74.667
2023	74.723
2024	74.761
2025	74.78
2026	74.767
2027	74.741
2028	74.708
2029	74.676
2030	74.652