Year	Percent
1990	69.454
1991	70.063
1992	70.361
1993	70.381
1994	70.274
1995	70.143
1996	69.945
1997	69.75
1998	69.579
1999	69.453
2000	69.382
2001	69.429
2002	69.49
2003	69.558
2004	69.623
2005	69.681
2006	69.75
2007	69.806
2008	69.848
2009	69.873
2010	69.884
2011	69.888
2012	69.876
2013	69.638
2014	69.427
2015	69.073
2016	68.884
2017	68.899
2018	68.921
2019	68.952
2020	68.995
2021	69.051
2022	69.115
2023	69.185
2024	69.26
2025	69.341
2026	69.429
2027	69.518
2028	69.612
2029	69.717
2030	69.837