Year	Percent
1950	12.85621
1955	8.42186
1960	7.88577
1965	11.32208
1970	12.87788
1975	13.0884
1980	12.52431
1985	12.00735
1990	11.62469
1995	12.76581
2000	13.93548
2005	12.73877
2010	11.52109
2015	9.85203
2020	10.46359
2025	11.11495
2030	10.65547
2035	9.79295
2040	8.99169
2045	8.66422
2050	8.65668
2055	8.55571
2060	8.15401
2065	7.62763
2070	7.20811
2075	6.98113
2080	6.83098
2085	6.63406
2090	6.33938
2095	6.04563
2100	5.81651