Year	Percent
1950	9.22192
1955	12.10963
1960	10.75848
1965	9.69764
1970	8.22315
1975	8.4762
1980	8.19121
1985	8.19572
1990	7.40285
1995	6.04158
2000	4.8803
2005	4.69063
2010	5.80327
2015	6.01743
2020	5.83144
2025	5.47812
2030	5.10912
2035	4.98833
2040	5.21725
2045	5.52964
2050	5.62654
2055	5.48711
2060	5.28918
2065	5.19842
2070	5.26982
2075	5.4186
2080	5.48979
2085	5.41947
2090	5.26298
2095	5.13984
2100	5.11648