Year	Percent
1950	13.93278
1955	13.87368
1960	15.48049
1965	15.48637
1970	15.24141
1975	15.15429
1980	15.95408
1985	14.33716
1990	12.86876
1995	12.0963
2000	11.47891
2005	10.93898
2010	9.9651
2015	9.05447
2020	8.58578
2025	7.95183
2030	7.33041
2035	6.75687
2040	6.28671
2045	5.91299
2050	5.62743
2055	5.38703
2060	5.18485
2065	4.99719
2070	4.86006
2075	4.75434
2080	4.68356
2085	4.63528
2090	4.59586
2095	4.56719
2100	4.54327