Year	Percent
1990	82.7
1991	82.731
1992	82.804
1993	82.779
1994	82.895
1995	82.957
1996	83.056
1997	83.148
1998	83.894
1999	82.064
2000	82.692
2001	83.658
2002	83.243
2003	83.254
2004	81.432
2005	81.542
2006	82.221
2007	82.736
2008	85.536
2009	85.845
2010	86.321
2011	85.316
2012	85.717
2013	84.753
2014	83.986
2015	84.586
2016	85.534
2017	85.693
2018	85.853
2019	86.021
2020	86.201
2021	86.386
2022	86.579
2023	86.779
2024	86.985
2025	87.198
2026	87.415
2027	87.641
2028	87.871
2029	88.1
2030	88.323