Year	Percent
1990	6.256
1991	6.301
1992	6.28
1993	6.412
1994	6.422
1995	6.518
1996	6.713
1997	6.865
1998	7.273
1999	7.662
2000	7.732
2001	7.875
2002	8.127
2003	8.282
2004	8.167
2005	8.205
2006	8.489
2007	8.589
2008	8.825
2009	9.134
2010	8.96
2011	8.655
2012	8.482
2013	8.534
2014	8.64
2015	8.49
2016	7.92
2017	8.003
2018	8.085
2019	8.168
2020	8.25
2021	8.333
2022	8.416
2023	8.498
2024	8.581
2025	8.664
2026	8.746
2027	8.829
2028	8.911
2029	8.994
2030	9.077