Year	Percent
1950	21.46435
1955	21.66936
1960	21.65826
1965	21.78659
1970	21.89724
1975	21.4583
1980	20.87432
1985	20.08723
1990	19.7002
1995	19.86751
2000	20.38045
2005	20.7227
2010	20.88301
2015	21.32752
2020	22.64462
2025	23.61882
2030	24.58047
2035	25.20991
2040	24.91731
2045	25.03012
2050	25.08127
2055	25.14413
2060	25.30456
2065	25.25202
2070	25.13037
2075	24.89226
2080	24.66111
2085	24.45337
2090	24.25451
2095	24.04428
2100	23.8199