Year	Percent
1950	20.30286
1955	21.28644
1960	21.10789
1965	20.06053
1970	21.66662
1975	22.8811
1980	25.2853
1985	25.15689
1990	24.47033
1995	25.58901
2000	26.06125
2005	27.49394
2010	27.54112
2015	28.0847
2020	28.13557
2025	28.56963
2030	30.16745
2035	29.17173
2040	26.69705
2045	24.44518
2050	22.96899
2055	22.98602
2060	24.63676
2065	25.44157
2070	24.40169
2075	23.62675
2080	23.057
2085	23.04715
2090	23.5286
2095	23.94486
2100	23.84042