Year	Percent
1990	75.354
1991	75.485
1992	75.299
1993	75.188
1994	76.047
1995	74.794
1996	74.563
1997	74.266
1998	73.916
1999	76.127
2000	75.94
2001	74.977
2002	75.463
2003	75.889
2004	76.275
2005	76.588
2006	76.789
2007	76.962
2008	77.597
2009	78.239
2010	79.228
2011	79.333
2012	79.496
2013	79.649
2014	78.654
2015	77.429
2016	77.48
2017	77.698
2018	77.836
2019	77.938
2020	78.032
2021	78.159
2022	78.287
2023	78.38
2024	78.386
2025	78.286
2026	78.13
2027	77.891
2028	77.625
2029	77.416
2030	77.313