Year	Percent
1950	9.26359
1955	8.44535
1960	7.7299
1965	7.7525
1970	7.81247
1975	7.94596
1980	7.95698
1985	8.28513
1990	9.50385
1995	9.78189
2000	10.38927
2005	9.19386
2010	10.03337
2015	12.41706
2020	14.87848
2025	18.01589
2030	20.9346
2035	23.64695
2040	25.97036
2045	27.89267
2050	28.80602
2055	29.00428
2060	28.40367
2065	27.83595
2070	28.35515
2075	30.10482
2080	31.57357
2085	32.45828
2090	33.1187
2095	33.85616
2100	34.71466