Year	Percent
1990	57.976
1991	59.748
1992	58.698
1993	58.919
1994	59.998
1995	61.224
1996	61.666
1997	62.373
1998	62.86
1999	63.809
2000	64.79
2001	66.361
2002	68.109
2003	68.137
2004	68.721
2005	69.347
2006	70.235
2007	70.91
2008	71.354
2009	72.496
2010	71.691
2011	73.095
2012	74.261
2013	75.399
2014	75.612
2015	75.99
2016	75.721
2017	76.022
2018	76.336
2019	76.648
2020	76.942
2021	77.185
2022	77.412
2023	77.629
2024	77.845
2025	78.062
2026	78.265
2027	78.469
2028	78.679
2029	78.902
2030	79.141