Year	Percent
1950	12.95046
1955	13.53709
1960	13.67246
1965	13.43937
1970	13.36615
1975	13.49568
1980	14.39543
1985	14.20528
1990	14.07136
1995	14.57607
2000	14.88463
2005	13.09426
2010	11.45919
2015	11.09848
2020	10.37767
2025	9.67461
2030	8.89662
2035	8.17678
2040	7.55533
2045	7.02128
2050	6.55455
2055	6.14491
2060	5.79458
2065	5.50508
2070	5.286
2075	5.11955
2080	4.98459
2085	4.87573
2090	4.78996
2095	4.72535
2100	4.68052