Year	Percent
1950	14.12161
1955	15.76952
1960	16.78149
1965	16.39972
1970	14.55579
1975	13.47062
1980	12.44321
1985	11.92097
1990	11.7642
1995	10.29151
2000	8.70081
2005	6.87806
2010	5.66854
2015	5.72696
2020	5.52771
2025	5.43218
2030	5.18215
2035	4.75515
2040	4.36552
2045	4.23149
2050	4.28898
2055	4.33417
2060	4.29126
2065	4.16571
2070	4.03268
2075	3.98187
2080	4.02995
2085	4.10971
2090	4.15218
2095	4.13302
2100	4.07996