Year	Percent
1990	90.13
1991	90.178
1992	90.522
1993	91.163
1994	91.673
1995	92.149
1996	91.343
1997	90.876
1998	90.839
1999	91.117
2000	91.498
2001	90.724
2002	90.587
2003	90.944
2004	91.657
2005	92.54
2006	91.521
2007	91.286
2008	91.536
2009	92.167
2010	93.263
2011	93.072
2012	92.896
2013	92.854
2014	93.008
2015	93.295
2016	92.551
2017	91.971
2018	91.656
2019	91.577
2020	91.64
2021	90.777
2022	90.061
2023	89.561
2024	89.297
2025	89.209
2026	88.377
2027	87.682
2028	87.185
2029	86.911
2030	86.814