Year	Percent
1990	85.347
1991	85.628
1992	86.112
1993	86.682
1994	86.863
1995	86.708
1996	86.3
1997	85.761
1998	84.965
1999	84.232
2000	82.61
2001	86.84
2002	87.31
2003	87.639
2004	87.626
2005	88.116
2006	88.642
2007	89.122
2008	89.556
2009	89.965
2010	90.362
2011	90.187
2012	90.013
2013	89.843
2014	89.712
2015	89.606
2016	89.532
2017	89.837
2018	90.136
2019	90.394
2020	90.589
2021	90.741
2022	90.841
2023	90.91
2024	90.977
2025	91.058
2026	91.159
2027	91.27
2028	91.382
2029	91.481
2030	91.561