Year	Percent
1950	22.28546
1955	23.14134
1960	21.41589
1965	22.76787
1970	23.31331
1975	23.40408
1980	25.4312
1985	24.01264
1990	23.39945
1995	24.43813
2000	25.12524
2005	25.60842
2010	27.39865
2015	27.45654
2020	28.08834
2025	29.06433
2030	28.59668
2035	27.02401
2040	25.03838
2045	24.44966
2050	23.24332
2055	23.15209
2060	23.19028
2065	23.19569
2070	22.82967
2075	22.7099
2080	22.68246
2085	22.70914
2090	22.74578
2095	22.70618
2100	22.53969