Year	Percent
1950	13.18314
1955	12.80878
1960	13.13964
1965	13.81071
1970	13.43172
1975	13.2832
1980	12.89128
1985	11.65063
1990	11.79887
1995	12.28249
2000	12.14523
2005	11.65792
2010	11.16116
2015	9.89889
2020	9.40512
2025	8.88338
2030	8.6407
2035	8.2561
2040	7.78108
2045	7.3212
2050	6.95569
2055	6.65766
2060	6.41592
2065	6.19209
2070	5.97573
2075	5.79135
2080	5.64417
2085	5.51311
2090	5.38463
2095	5.27515
2100	5.19022