Year	Percent
1990	57.439
1991	57.586
1992	57.71
1993	57.806
1994	57.867
1995	57.889
1996	57.853
1997	57.778
1998	57.69
1999	57.627
2000	57.611
2001	57.842
2002	58.125
2003	58.452
2004	58.81
2005	59.188
2006	59.57
2007	60.024
2008	60.306
2009	60.774
2010	60.649
2011	61.29
2012	61.779
2013	62.368
2014	62.842
2015	63.177
2016	63.509
2017	63.828
2018	64.14
2019	64.441
2020	64.729
2021	65.019
2022	65.295
2023	65.563
2024	65.826
2025	66.087
2026	66.358
2027	66.629
2028	66.897
2029	67.158
2030	67.412