Year	Percent
1950	16.74223
1955	17.55724
1960	18.46473
1965	18.79341
1970	18.9485
1975	19.13007
1980	18.75889
1985	18.14401
1990	21.7206
1995	21.34956
2000	21.05422
2005	22.0209
2010	22.99473
2015	25.37245
2020	27.72335
2025	30.25436
2030	32.51025
2035	34.39945
2040	35.58578
2045	36.23809
2050	36.35093
2055	36.65901
2060	36.61811
2065	36.75487
2070	36.81893
2075	36.95048
2080	37.16248
2085	37.46159
2090	37.83294
2095	38.25349
2100	38.71134