Year	Percent
1990	37.641
1991	37.572
1992	37.532
1993	37.508
1994	37.498
1995	37.529
1996	37.605
1997	37.69
1998	37.795
1999	37.938
2000	38.112
2001	38.223
2002	38.356
2003	38.51
2004	38.657
2005	38.824
2006	39.087
2007	39.366
2008	39.67
2009	39.976
2010	40.287
2011	40.635
2012	41.015
2013	41.411
2014	41.778
2015	42.114
2016	42.399
2017	42.657
2018	42.899
2019	43.119
2020	43.311
2021	43.471
2022	43.602
2023	43.713
2024	43.819
2025	43.929
2026	44.037
2027	44.146
2028	44.255
2029	44.367
2030	44.479