Year	Percent
1950	19.55174
1955	19.09755
1960	18.15468
1965	18.97458
1970	19.56193
1975	21.16746
1980	22.21475
1985	21.64801
1990	24.40325
1995	26.22895
2000	27.89486
2005	29.1177
2010	27.17767
2015	26.16015
2020	25.75265
2025	26.23726
2030	27.82529
2035	28.65684
2040	27.90196
2045	26.05808
2050	24.01353
2055	22.51188
2060	22.10676
2065	22.63381
2070	23.08672
2075	22.98095
2080	22.55056
2085	22.04197
2090	21.80295
2095	21.92954
2100	22.19172