Year	Percent
1950	29.46807
1955	28.9908
1960	28.36285
1965	27.72957
1970	27.08894
1975	27.65994
1980	27.85054
1985	27.65118
1990	27.32952
1995	26.59891
2000	26.45793
2005	26.83653
2010	27.53625
2015	28.36125
2020	29.10782
2025	29.79769
2030	30.4256
2035	30.89738
2040	31.24436
2045	31.42725
2050	31.4429
2055	31.3504
2060	31.13476
2065	30.82624
2070	30.43686
2075	29.98972
2080	29.51777
2085	29.0232
2090	28.51884
2095	28.01283
2100	27.50046