Year	Percent
1990	73.408
1991	72.027
1992	70.656
1993	69.858
1994	69.09
1995	69.105
1996	69.275
1997	69.728
1998	69.928
1999	71.525
2000	71.585
2001	72.186
2002	72.702
2003	72.423
2004	72.388
2005	72.674
2006	73.234
2007	73.798
2008	73.905
2009	73.508
2010	72.555
2011	72.551
2012	73.213
2013	73.312
2014	73.908
2015	74.39
2016	74.109
2017	74.308
2018	74.487
2019	74.647
2020	74.787
2021	74.886
2022	74.959
2023	75.026
2024	75.113
2025	75.234
2026	75.367
2027	75.53
2028	75.72
2029	75.928
2030	76.147