Year	Percent
1950	29.45572
1955	30.18737
1960	31.65604
1965	29.40323
1970	28.62169
1975	27.92747
1980	27.76697
1985	29.17311
1990	28.65367
1995	26.81263
2000	26.26764
2005	25.76937
2010	25.44367
2015	24.54653
2020	23.44448
2025	21.82255
2030	21.04232
2035	20.89911
2040	20.37043
2045	20.35364
2050	19.71721
2055	19.22091
2060	19.10327
2065	19.27779
2070	19.51892
2075	19.68094
2080	19.67753
2085	19.54988
2090	19.45984
2095	19.51173
2100	19.65261