Year	Percent
1950	27.2531
1955	27.44923
1960	25.1818
1965	24.77163
1970	24.29313
1975	24.1179
1980	25.04621
1985	23.90349
1990	24.61736
1995	25.39216
2000	27.03251
2005	28.97209
2010	28.77558
2015	28.64797
2020	27.52724
2025	26.33689
2030	25.452
2035	24.99538
2040	24.36142
2045	23.77042
2050	23.55608
2055	23.40802
2060	23.72146
2065	23.93667
2070	23.70623
2075	23.33084
2080	22.9746
2085	22.82695
2090	22.82693
2095	22.87021
2100	22.80992