Year	Percent
1950	29.34311
1955	28.56196
1960	27.68067
1965	27.14348
1970	26.32428
1975	27.0679
1980	29.26903
1985	30.88191
1990	32.94855
1995	33.53672
2000	32.95169
2005	32.48355
2010	31.66951
2015	31.02247
2020	30.44619
2025	29.17005
2030	27.88665
2035	27.00047
2040	26.00931
2045	25.05262
2050	24.47133
2055	23.59499
2060	22.86557
2065	22.33626
2070	21.88092
2075	21.47924
2080	21.11411
2085	20.7788
2090	20.48409
2095	20.24739
2100	20.06671