Year	Percent
1950	30.38058
1955	30.46882
1960	32.60342
1965	29.77543
1970	26.83357
1975	26.04605
1980	26.24492
1985	28.55706
1990	28.60592
1995	28.27472
2000	27.41583
2005	27.36715
2010	28.21098
2015	27.34491
2020	25.18214
2025	22.34072
2030	20.15579
2035	20.17983
2040	21.53195
2045	22.65999
2050	22.57773
2055	21.57289
2060	20.94562
2065	21.06715
2070	21.82462
2075	22.59356
2080	22.78254
2085	22.35478
2090	21.7608
2095	21.46866
2100	21.56584