Year	Percent
1950	16.15289
1955	18.37759
1960	18.91833
1965	15.05838
1970	11.30901
1975	9.81343
1980	7.84894
1985	7.89159
1990	7.35095
1995	8.34626
2000	6.29712
2005	5.5666
2010	4.99846
2015	4.55622
2020	4.25857
2025	3.99921
2030	3.84764
2035	3.65398
2040	3.46342
2045	3.32516
2050	3.25454
2055	3.2309
2060	3.23158
2065	3.22767
2070	3.21037
2075	3.18736
2080	3.17841
2085	3.17264
2090	3.17366
2095	3.17399
2100	3.1622