Year	Percent
1950	13.76429
1955	14.17093
1960	14.56788
1965	14.39888
1970	14.40486
1975	14.41106
1980	12.10635
1985	13.00101
1990	13.66226
1995	14.26227
2000	12.54397
2005	12.09626
2010	13.60468
2015	14.01462
2020	12.46281
2025	12.11463
2030	11.46756
2035	11.50652
2040	14.24439
2045	15.66101
2050	17.60388
2055	19.29736
2060	19.92902
2065	21.08558
2070	22.04436
2075	22.85219
2080	23.59294
2085	24.0866
2090	24.35054
2095	24.52317
2100	24.66619