Year	Percent
1950	29.45621
1955	28.05497
1960	27.25066
1965	27.0634
1970	29.24489
1975	31.00679
1980	32.80373
1985	34.39554
1990	34.08541
1995	32.97265
2000	30.58461
2005	27.74563
2010	25.57805
2015	24.90378
2020	24.89856
2025	24.91003
2030	24.19425
2035	23.24801
2040	22.71565
2045	22.30428
2050	22.35775
2055	22.573
2060	22.53631
2065	22.23472
2070	21.86736
2075	21.62209
2080	21.55821
2085	21.59949
2090	21.58578
2095	21.42967
2100	21.19741