Year	Percent
1950	6.24934
1955	5.52127
1960	5.13281
1965	4.95085
1970	4.93133
1975	4.98605
1980	4.96339
1985	4.91001
1990	5.14153
1995	5.11249
2000	4.88864
2005	4.75454
2010	4.69463
2015	4.80118
2020	4.98967
2025	5.29574
2030	5.7352
2035	6.34774
2040	7.07894
2045	7.82054
2050	8.51687
2055	9.08337
2060	9.69526
2065	10.56303
2070	11.61741
2075	12.66169
2080	13.63964
2085	14.58461
2090	15.57026
2095	16.60731
2100	17.68123