Year	Percent
1950	7.81907
1955	7.75918
1960	8.7683
1965	7.54455
1970	5.76038
1975	6.32943
1980	6.82812
1985	7.76092
1990	5.77131
1995	5.63305
2000	5.43657
2005	4.53434
2010	4.49099
2015	4.58564
2020	4.31492
2025	4.30005
2030	4.28649
2035	4.27258
2040	4.20761
2045	4.19888
2050	4.24672
2055	4.28469
2060	4.3295
2065	4.38607
2070	4.43175
2075	4.46324
2080	4.49204
2085	4.52322
2090	4.5513
2095	4.56582
2100	4.56276