Year	Percent
1950	12.59693
1955	12.43201
1960	12.40245
1965	12.46766
1970	13.23482
1975	14.636
1980	15.12529
1985	16.06173
1990	18.08455
1995	19.83435
2000	22.42721
2005	25.91565
2010	27.30796
2015	27.46305
2020	28.06476
2025	26.94992
2030	26.72888
2035	28.07209
2040	27.87788
2045	28.89865
2050	28.86858
2055	26.88357
2060	25.30116
2065	23.67002
2070	23.19505
2075	23.5481
2080	23.80794
2085	23.65742
2090	23.17743
2095	22.75683
2100	22.6384