Year	Percent
1950	13.09108
1955	12.20157
1960	11.72288
1965	12.49439
1970	12.66095
1975	13.91955
1980	14.17451
1985	15.09064
1990	14.92709
1995	15.07336
2000	15.00464
2005	15.40122
2010	15.55157
2015	15.37123
2020	15.10941
2025	14.52042
2030	13.87511
2035	13.23045
2040	12.59521
2045	11.94417
2050	11.25892
2055	10.5866
2060	9.97403
2065	9.44723
2070	8.98313
2075	8.57637
2080	8.19608
2085	7.8466
2090	7.53679
2095	7.28317
2100	7.04931