Year	Percent
1990	77.05
1991	77.087
1992	77.177
1993	77.319
1994	77.291
1995	77.195
1996	77.071
1997	77.417
1998	77.66
1999	77.924
2000	76.621
2001	81.581
2002	80.002
2003	78.092
2004	75.715
2005	76.913
2006	78.065
2007	79.157
2008	80.197
2009	81.02
2010	81.844
2011	81.608
2012	81.374
2013	81.152
2014	80.972
2015	80.823
2016	80.7
2017	80.94
2018	81.19
2019	81.418
2020	81.603
2021	81.751
2022	81.859
2023	81.939
2024	82.014
2025	82.099
2026	82.195
2027	82.302
2028	82.416
2029	82.53
2030	82.641