Year	Percent
1950	11.77943
1955	10.80859
1960	11.92049
1965	11.83802
1970	11.41802
1975	9.75135
1980	9.15534
1985	8.35174
1990	8.73965
1995	7.80833
2000	7.10297
2005	6.62034
2010	6.31522
2015	6.2772
2020	5.88039
2025	5.53009
2030	5.2822
2035	5.11395
2040	4.99242
2045	4.91921
2050	4.84403
2055	4.75371
2060	4.66818
2065	4.61138
2070	4.59043
2075	4.59013
2080	4.59082
2085	4.58447
2090	4.57283
2095	4.56515
2100	4.56581