Year	Percent
1990	88.342
1991	88.271
1992	88.131
1993	88.019
1994	87.887
1995	87.698
1996	87.678
1997	87.574
1998	87.425
1999	87.338
2000	87.277
2001	87.354
2002	87.366
2003	87.451
2004	87.479
2005	89.088
2006	90.303
2007	89.584
2008	88.817
2009	88.014
2010	87.188
2011	86.356
2012	89.784
2013	85.476
2014	86.407
2015	87.473
2016	86.897
2017	86.954
2018	87.02
2019	87.107
2020	87.222
2021	87.37
2022	87.542
2023	87.724
2024	87.895
2025	88.042
2026	88.174
2027	88.283
2028	88.371
2029	88.446
2030	88.51