Year	Percent
1990	76.245
1991	76.363
1992	76.5
1993	76.654
1994	76.806
1995	78.834
1996	80.71
1997	81.657
1998	80.973
1999	80.231
2000	80.761
2001	80.823
2002	81.171
2003	81.509
2004	81.176
2005	81.592
2006	81.668
2007	81.943
2008	82.469
2009	81.752
2010	81.859
2011	83.978
2012	83.378
2013	81.76
2014	81.592
2015	80.658
2016	80.679
2017	80.807
2018	80.936
2019	81.071
2020	81.213
2021	81.362
2022	81.516
2023	81.674
2024	81.836
2025	82.002
2026	82.172
2027	82.348
2028	82.528
2029	82.711
2030	82.894