Year	Percent
1950	29.37263
1955	28.7684
1960	28.11122
1965	27.34062
1970	26.98304
1975	27.49441
1980	27.93625
1985	28.50202
1990	29.21029
1995	29.6607
2000	30.10057
2005	30.44793
2010	30.40798
2015	30.39979
2020	30.72848
2025	31.05262
2030	31.43904
2035	31.48624
2040	31.10993
2045	30.67854
2050	30.28216
2055	29.99913
2060	29.69987
2065	29.34138
2070	28.91702
2075	28.4809
2080	28.06157
2085	27.65859
2090	27.27417
2095	26.86031
2100	26.4189