Year	Percent
1990	73.959
1991	74.048
1992	74.597
1993	74.599
1994	75.286
1995	75.616
1996	76.094
1997	76.656
1998	76.53
1999	76.767
2000	76.72
2001	76.381
2002	75.883
2003	75.646
2004	75.268
2005	75.247
2006	75.458
2007	75.368
2008	75.803
2009	75.644
2010	75.207
2011	74.652
2012	74.494
2013	73.876
2014	73.932
2015	73.691
2016	74.311
2017	74.17
2018	74.029
2019	73.887
2020	73.743
2021	73.598
2022	73.451
2023	73.303
2024	73.155
2025	73.008
2026	72.861
2027	72.714
2028	72.567
2029	72.42
2030	72.272