Year	Percent
1950	22.99907
1955	23.58647
1960	21.05979
1965	21.71283
1970	21.92732
1975	21.54511
1980	22.29811
1985	21.22397
1990	21.57056
1995	23.56841
2000	25.99852
2005	27.50024
2010	27.77801
2015	27.40538
2020	27.98756
2025	28.76189
2030	29.83113
2035	29.49894
2040	27.11437
2045	24.5797
2050	22.81179
2055	21.95917
2060	22.45406
2065	23.29744
2070	23.36837
2075	22.96322
2080	22.44914
2085	22.17024
2090	22.28232
2095	22.62086
2100	22.80264