Year	Percent
1950	13.66769
1955	12.0998
1960	15.16027
1965	14.51014
1970	14.47971
1975	15.10866
1980	12.68382
1985	11.42449
1990	11.30935
1995	12.34825
2000	10.36154
2005	9.27582
2010	8.38364
2015	7.80858
2020	7.60215
2025	7.18004
2030	6.67922
2035	6.34673
2040	6.05289
2045	5.8026
2050	5.6098
2055	5.44133
2060	5.28139
2065	5.13074
2070	5.00994
2075	4.92003
2080	4.85401
2085	4.79885
2090	4.75069
2095	4.70127
2100	4.66423