Year	Percent
1950	13.97306
1955	14.31332
1960	12.73954
1965	13.3373
1970	13.65009
1975	13.92277
1980	13.9827
1985	14.2504
1990	14.03077
1995	15.38254
2000	13.88644
2005	11.27062
2010	9.5593
2015	8.85019
2020	8.06065
2025	7.67754
2030	7.08069
2035	6.45655
2040	5.93078
2045	5.57642
2050	5.36712
2055	5.23383
2060	5.10508
2065	4.96838
2070	4.85229
2075	4.79254
2080	4.79099
2085	4.81486
2090	4.82636
2095	4.80916
2100	4.77887