Year	Percent
1950	12.74245
1955	14.01478
1960	15.86857
1965	14.62248
1970	13.34573
1975	12.78709
1980	12.14985
1985	11.73781
1990	11.42993
1995	12.03001
2000	10.85631
2005	9.99735
2010	8.91724
2015	8.35553
2020	8.02717
2025	7.76408
2030	7.39576
2035	6.94791
2040	6.50997
2045	6.15642
2050	5.916
2055	5.75199
2060	5.58788
2065	5.38721
2070	5.17349
2075	4.98458
2080	4.85563
2085	4.77334
2090	4.71195
2095	4.64937
2100	4.57133