Year	Percent
1950	6.67963
1955	5.80436
1960	6.58396
1965	6.99086
1970	7.58037
1975	7.25771
1980	5.23353
1985	4.72489
1990	5.06876
1995	5.3946
2000	4.85883
2005	4.63615
2010	4.27047
2015	4.11363
2020	4.18874
2025	4.35277
2030	4.4392
2035	4.35132
2040	4.19694
2045	4.10659
2050	4.13393
2055	4.2683
2060	4.41209
2065	4.47694
2070	4.44911
2075	4.38868
2080	4.35784
2085	4.38943
2090	4.4392
2095	4.47156
2100	4.4572