Year	Percent
1990	64.795
1991	65.308
1992	68.543
1993	67.362
1994	68.357
1995	69.879
1996	70.492
1997	71.088
1998	71.664
1999	72.84
2000	73.986
2001	75.482
2002	75.668
2003	75.84
2004	75.71
2005	75.502
2006	75.965
2007	75.747
2008	76.79
2009	77.792
2010	78.406
2011	79.777
2012	79.746
2013	78.94
2014	79.623
2015	80.545
2016	80.62
2017	80.855
2018	81.088
2019	81.317
2020	81.542
2021	81.764
2022	81.984
2023	82.203
2024	82.425
2025	82.651
2026	82.879
2027	83.109
2028	83.342
2029	83.576
2030	83.81