Year	Percent
1950	27.79501
1955	28.9093
1960	28.54815
1965	28.67453
1970	28.58364
1975	26.43861
1980	27.01851
1985	26.31711
1990	26.38598
1995	28.25706
2000	29.89981
2005	30.59227
2010	31.40376
2015	30.1452
2020	29.53044
2025	29.85256
2030	30.89346
2035	31.48341
2040	31.24093
2045	30.59376
2050	29.81437
2055	29.30707
2060	29.07813
2065	28.83112
2070	28.38327
2075	27.75577
2080	27.07746
2085	26.46773
2090	25.95341
2095	25.47072
2100	24.96909