Year	Percent
1950	8.76989
1955	9.01382
1960	6.70157
1965	7.52389
1970	7.39331
1975	7.57678
1980	7.03415
1985	6.80315
1990	6.95541
1995	6.90742
2000	7.31471
2005	7.57704
2010	5.8208
2015	4.42538
2020	4.87975
2025	5.95305
2030	5.59346
2035	5.5764
2040	5.2939
2045	4.86779
2050	4.75817
2055	5.01833
2060	5.29259
2065	5.35048
2070	5.22092
2075	5.04246
2080	4.94403
2085	4.99793
2090	5.12376
2095	5.18882
2100	5.13326