Year	Percent
1950	26.67571
1955	27.64385
1960	24.94081
1965	25.01876
1970	23.9285
1975	22.46392
1980	22.95985
1985	22.9196
1990	24.9573
1995	27.13987
2000	28.93352
2005	28.96243
2010	27.54763
2015	28.31309
2020	30.53452
2025	31.33039
2030	31.63026
2035	29.73493
2040	25.80241
2045	23.65772
2050	22.86217
2055	22.74786
2060	24.04239
2065	24.82638
2070	24.25869
2075	23.54062
2080	23.05169
2085	23.04218
2090	23.39703
2095	23.76062
2100	23.69727