Year	Percent
1950	14.56954
1955	15.34589
1960	15.43595
1965	15.90349
1970	14.63055
1975	12.84032
1980	12.49429
1985	13.25578
1990	13.27381
1995	12.08125
2000	12.03795
2005	10.07949
2010	9.58257
2015	10.00732
2020	9.53494
2025	8.86745
2030	8.34809
2035	8.03811
2040	7.81823
2045	7.54872
2050	7.25301
2055	6.95702
2060	6.67425
2065	6.42751
2070	6.22329
2075	6.06509
2080	5.91912
2085	5.763
2090	5.62127
2095	5.49019
2100	5.38295