Year	Percent
1990	70.294
1991	71.431
1992	72.69
1993	74.077
1994	74.743
1995	75.205
1996	75.392
1997	75.597
1998	75.759
1999	75.7
2000	75.618
2001	75.561
2002	75.492
2003	75.355
2004	75.213
2005	75.426
2006	75.598
2007	76.099
2008	77.072
2009	78.485
2010	78.279
2011	78.273
2012	78.195
2013	78.1
2014	78.09
2015	78.086
2016	78.231
2017	78.587
2018	78.957
2019	79.236
2020	79.361
2021	79.34
2022	79.182
2023	78.942
2024	78.702
2025	78.509
2026	78.345
2027	78.211
2028	78.096
2029	77.984
2030	77.876