Year	Percent
1990	63.019
1991	63.476
1992	63.346
1993	63.341
1994	64.565
1995	65.57
1996	67.062
1997	66.91
1998	66.719
1999	66.995
2000	67.151
2001	68.161
2002	68.84
2003	69.026
2004	69.233
2005	70.38
2006	70.948
2007	71.401
2008	71.559
2009	71.469
2010	71.18
2011	71.586
2012	71.746
2013	72.476
2014	73.692
2015	73.685
2016	74.978
2017	75.129
2018	75.275
2019	75.41
2020	75.531
2021	75.632
2022	75.713
2023	75.785
2024	75.867
2025	75.972
2026	76.091
2027	76.232
2028	76.386
2029	76.542
2030	76.69