Year	Percent
1950	30.27653
1955	30.5446
1960	31.00039
1965	30.65235
1970	27.02335
1975	30.77252
1980	38.58034
1985	41.91641
1990	42.72973
1995	42.49857
2000	39.6242
2005	43.36515
2010	47.25143
2015	45.21301
2020	48.03015
2025	42.86843
2030	40.60607
2035	38.52436
2040	36.17614
2045	34.62334
2050	31.99048
2055	29.41733
2060	27.18536
2065	25.66132
2070	24.57255
2075	23.58045
2080	22.99596
2085	22.75799
2090	22.65959
2095	22.53308
2100	22.32428