Year	Percent
1950	24.38261
1955	25.28315
1960	25.65315
1965	25.83626
1970	24.64418
1975	22.67567
1980	21.14763
1985	20.96459
1990	22.93878
1995	24.9217
2000	26.79018
2005	27.73393
2010	27.68074
2015	27.62943
2020	26.88454
2025	26.25488
2030	25.47311
2035	25.15986
2040	25.41821
2045	25.27463
2050	25.0664
2055	24.55386
2060	24.28119
2065	24.30213
2070	24.1923
2075	24.18928
2080	23.97721
2085	23.68177
2090	23.41115
2095	23.21598
2100	23.07871