Year	Percent
1950	29.35354
1955	26.86795
1960	25.35208
1965	25.15406
1970	26.59343
1975	27.28776
1980	27.99127
1985	27.57598
1990	26.72267
1995	26.46187
2000	25.84005
2005	25.04439
2010	25.03429
2015	25.77736
2020	25.13669
2025	24.4795
2030	23.72723
2035	22.67477
2040	23.42517
2045	23.94712
2050	23.78848
2055	23.42382
2060	22.93991
2065	22.58737
2070	22.50552
2075	22.58506
2080	22.56876
2085	22.36398
2090	22.04232
2095	21.71045
2100	21.46548