Year	Percent
1990	26.572
1991	27.528
1992	28.515
1993	29.53
1994	30.572
1995	31.635
1996	32.724
1997	32.315
1998	31.909
1999	31.51
2000	31.118
2001	30.735
2002	30.357
2003	29.984
2004	29.615
2005	29.251
2006	28.893
2007	28.542
2008	28.199
2009	27.864
2010	28.037
2011	28.39
2012	28.846
2013	29.221
2014	29.607
2015	30.042
2016	30.426
2017	30.321
2018	30.216
2019	30.108
2020	29.994
2021	29.873
2022	29.748
2023	29.618
2024	29.488
2025	29.361
2026	29.234
2027	29.11
2028	28.989
2029	28.872
2030	28.76