Year	Percent
1950	10.28071
1955	11.65306
1960	12.98303
1965	12.58924
1970	13.01737
1975	11.82956
1980	10.63446
1985	9.90049
1990	9.12391
1995	8.96062
2000	9.34437
2005	9.44784
2010	8.97648
2015	8.59606
2020	7.74444
2025	7.31417
2030	7.0889
2035	6.93827
2040	6.69405
2045	6.36643
2050	6.02943
2055	5.74764
2060	5.55898
2065	5.43992
2070	5.3186
2075	5.1589
2080	4.9842
2085	4.83806
2090	4.74417
2095	4.69264
2100	4.65233