Year	Percent
1990	26.209
1991	26.57
1992	26.829
1993	27.092
1994	27.48
1995	27.812
1996	28.249
1997	28.664
1998	29.187
1999	29.643
2000	30.052
2001	30.515
2002	29.622
2003	32.154
2004	33.234
2005	33.158
2006	32.661
2007	32.178
2008	31.705
2009	31.638
2010	31.573
2011	31.51
2012	30.621
2013	31.007
2014	31.073
2015	31.182
2016	31.237
2017	31.249
2018	31.264
2019	31.281
2020	31.3
2021	31.322
2022	31.345
2023	31.372
2024	31.405
2025	31.444
2026	31.489
2027	31.54
2028	31.595
2029	31.652
2030	31.707