Year	Percent
1990	62.848
1991	63.289
1992	63.768
1993	64.147
1994	64.571
1995	64.174
1996	63.762
1997	63.334
1998	63.825
1999	64.31
2000	64.788
2001	65.747
2002	66.691
2003	67.621
2004	68.539
2005	69.444
2006	70.337
2007	71.216
2008	72.08
2009	72.924
2010	73.746
2011	74.554
2012	75.341
2013	76.109
2014	76.86
2015	77.166
2016	77.287
2017	77.581
2018	77.877
2019	78.177
2020	78.481
2021	78.79
2022	79.104
2023	79.42
2024	79.738
2025	80.056
2026	80.375
2027	80.694
2028	81.011
2029	81.326
2030	81.638