Year	Percent
1950	29.48083
1955	29.57842
1960	29.34206
1965	28.84445
1970	27.82495
1975	26.99214
1980	26.75448
1985	26.87867
1990	26.57537
1995	26.29633
2000	26.02583
2005	27.4121
2010	26.85157
2015	28.45191
2020	30.04902
2025	31.99512
2030	33.83406
2035	34.58989
2040	34.54938
2045	33.85713
2050	32.88262
2055	32.20377
2060	31.3991
2065	30.54156
2070	29.58671
2075	28.60372
2080	27.6801
2085	26.8643
2090	26.18448
2095	25.59604
2100	25.05761