Year	Percent
1950	26.29885
1955	26.45315
1960	26.68995
1965	25.59035
1970	24.27099
1975	23.14277
1980	24.05212
1985	24.23571
1990	25.52339
1995	26.73942
2000	28.06662
2005	29.28856
2010	30.43957
2015	30.51227
2020	29.90946
2025	28.49528
2030	27.24397
2035	26.88913
2040	26.46241
2045	25.60879
2050	25.07321
2055	24.65809
2060	24.33054
2065	24.38694
2070	24.23643
2075	24.11979
2080	23.99679
2085	23.81952
2090	23.60101
2095	23.37708
2100	23.18412