Year	Percent
1990	81.914
1991	82.959
1992	83.964
1993	84.902
1994	85.692
1995	85.742
1996	85.784
1997	85.76
1998	85.56
1999	85.298
2000	85.212
2001	85.345
2002	85.507
2003	85.724
2004	85.79
2005	85.769
2006	85.866
2007	86.001
2008	86.202
2009	86.411
2010	86.437
2011	86.538
2012	86.62
2013	86.836
2014	87.1
2015	87.412
2016	87.671
2017	87.944
2018	88.208
2019	88.418
2020	88.546
2021	88.576
2022	88.524
2023	88.425
2024	88.332
2025	88.279
2026	88.238
2027	88.231
2028	88.249
2029	88.28
2030	88.314