Year	Percent
1950	4.13147
1955	3.50641
1960	3.2552
1965	3.19265
1970	3.29153
1975	3.43869
1980	4.6381
1985	5.32705
1990	6.11536
1995	6.74684
2000	7.84032
2005	8.37357
2010	10.66333
2015	13.89367
2020	16.71028
2025	19.80862
2030	21.82649
2035	23.17459
2040	25.36609
2045	26.46594
2050	27.60459
2055	29.86197
2060	31.58108
2065	33.54145
2070	34.52526
2075	34.66153
2080	34.65289
2085	34.72842
2090	34.97234
2095	35.24237
2100	35.42294