Year	Percent
1990	36.534
1991	36.387
1992	36.208
1993	36.138
1994	36.111
1995	36.138
1996	36.185
1997	36.289
1998	36.41
1999	36.45
2000	36.587
2001	36.769
2002	36.975
2003	37.241
2004	37.521
2005	37.847
2006	38.172
2007	38.602
2008	38.971
2009	39.392
2010	39.889
2011	40.339
2012	40.807
2013	41.305
2014	41.814
2015	42.341
2016	42.524
2017	42.855
2018	43.164
2019	43.436
2020	43.667
2021	43.847
2022	43.99
2023	44.095
2024	44.163
2025	44.195
2026	44.189
2027	44.154
2028	44.105
2029	44.065
2030	44.047