Year	Percent
1990	75.187
1991	75.911
1992	76.352
1993	76.321
1994	77.102
1995	77.381
1996	77.54
1997	77.548
1998	76.756
1999	76.124
2000	76.11
2001	75.971
2002	76.716
2003	76.92
2004	77.319
2005	77.084
2006	76.697
2007	76.655
2008	76.083
2009	75.665
2010	75.844
2011	76.087
2012	76.322
2013	76.39
2014	77.482
2015	77.654
2016	77.913
2017	78.11
2018	78.335
2019	78.569
2020	78.795
2021	79.002
2022	79.197
2023	79.375
2024	79.529
2025	79.653
2026	79.732
2027	79.772
2028	79.778
2029	79.756
2030	79.711