Year	Percent
1950	19.6555
1955	20.58322
1960	21.20952
1965	21.78346
1970	22.11446
1975	21.68027
1980	20.90575
1985	20.19394
1990	19.79659
1995	20.0543
2000	20.57503
2005	20.92578
2010	21.06206
2015	21.40233
2020	22.56303
2025	23.34025
2030	24.14099
2035	24.572
2040	24.12728
2045	24.16127
2050	24.15221
2055	24.18102
2060	24.30358
2065	24.21557
2070	24.06075
2075	23.80127
2080	23.559
2085	23.34285
2090	23.13653
2095	22.92061
2100	22.68967