Year	Percent
1990	66.494
1991	66.422
1992	66.346
1993	66.4
1994	66.402
1995	67.542
1996	68.598
1997	69.597
1998	70.543
1999	71.444
2000	72.729
2001	73.956
2002	75.144
2003	76.286
2004	77.375
2005	78.405
2006	78.271
2007	78.126
2008	77.967
2009	77.798
2010	77.626
2011	77.471
2012	77.318
2013	77.171
2014	77.109
2015	77.043
2016	76.997
2017	77.216
2018	77.445
2019	77.68
2020	77.918
2021	78.163
2022	78.411
2023	78.66
2024	78.903
2025	79.138
2026	79.366
2027	79.586
2028	79.798
2029	80.002
2030	80.198