Year	Percent
1990	68.945
1991	68.887
1992	68.852
1993	68.783
1994	68.909
1995	68.968
1996	68.946
1997	68.933
1998	68.975
1999	68.882
2000	68.899
2001	68.921
2002	68.983
2003	68.979
2004	69.013
2005	69.059
2006	69.098
2007	69.187
2008	69.193
2009	69.062
2010	69.065
2011	69.111
2012	69.135
2013	69.148
2014	69.189
2015	69.266
2016	69.304
2017	69.348
2018	69.398
2019	69.446
2020	69.49
2021	69.528
2022	69.56
2023	69.589
2024	69.627
2025	69.676
2026	69.737
2027	69.809
2028	69.884
2029	69.95
2030	69.999