Year	Percent
1990	90.864
1991	90.075
1992	89.074
1993	88.186
1994	86.956
1995	87.523
1996	86.727
1997	86.104
1998	85.228
1999	85.919
2000	85.313
2001	85.394
2002	85.721
2003	85.733
2004	85.621
2005	86.505
2006	86.266
2007	87.112
2008	87.576
2009	87.143
2010	86.641
2011	87.306
2012	87.566
2013	88.108
2014	87.988
2015	88.398
2016	88.48
2017	88.594
2018	88.71
2019	88.843
2020	89.003
2021	89.191
2022	89.408
2023	89.644
2024	89.882
2025	90.106
2026	90.318
2027	90.514
2028	90.696
2029	90.866
2030	91.03