Year	Percent
1950	17.39595
1955	16.64237
1960	14.92547
1965	14.61504
1970	14.66875
1975	15.0385
1980	15.19131
1985	15.62122
1990	15.95979
1995	17.03298
2000	18.62312
2005	20.25809
2010	21.84823
2015	23.13664
2020	24.47433
2025	25.53762
2030	26.07681
2035	25.99114
2040	25.85406
2045	25.49219
2050	25.25078
2055	25.19795
2060	24.85016
2065	24.45103
2070	23.99797
2075	23.45736
2080	22.99021
2085	22.66165
2090	22.43868
2095	22.21011
2100	21.97012