Year	Percent
1950	30.1199
1955	29.89667
1960	29.32976
1965	28.49829
1970	27.78406
1975	27.84576
1980	27.98153
1985	28.42275
1990	29.22553
1995	29.86182
2000	30.40424
2005	30.82014
2010	30.81809
2015	30.84954
2020	31.24928
2025	31.66214
2030	32.14194
2035	32.27011
2040	31.95802
2045	31.58001
2050	31.2408
2055	31.03053
2060	30.8192
2065	30.56188
2070	30.25586
2075	29.94135
2080	29.64429
2085	29.34752
2090	29.04973
2095	28.70906
2100	28.33042