Year	Percent
1950	17.41214
1955	15.92558
1960	15.16668
1965	15.03637
1970	15.51207
1975	16.01957
1980	11.99697
1985	12.95877
1990	13.35124
1995	15.20297
2000	17.41112
2005	20.04666
2010	21.77728
2015	24.83175
2020	27.05284
2025	28.8418
2030	29.59528
2035	29.0799
2040	28.36744
2045	27.06925
2050	25.548
2055	25.19412
2060	24.81119
2065	24.63273
2070	24.7277
2075	24.27209
2080	23.72721
2085	23.32908
2090	23.14777
2095	23.08265
2100	23.01873