Year	Percent
1950	12.1844
1955	11.28098
1960	13.30909
1965	13.01459
1970	12.7623
1975	12.90233
1980	13.12512
1985	13.45585
1990	13.60354
1995	13.63283
2000	13.39193
2005	13.16384
2010	11.93352
2015	10.43027
2020	8.72071
2025	8.27571
2030	7.80403
2035	7.18831
2040	6.47242
2045	5.88165
2050	5.50689
2055	5.23686
2060	5.00541
2065	4.78501
2070	4.59412
2075	4.45727
2080	4.37682
2085	4.34742
2090	4.33957
2095	4.33422
2100	4.32527