Quarter	Percentage Of Membership
1908-01-01	83.8000
1908-04-01	87.5000
1908-07-01	91.3000
1908-10-01	89.0000
1909-01-01	90.5000
1909-04-01	95.4000
1909-07-01	96.6000
1909-10-01	95.1000
1910-01-01	94.7000
1910-04-01	94.6000
1910-07-01	96.0000
1910-10-01	92.7000
1911-01-01	92.5000
1911-04-01	95.8000
1911-07-01	96.3000
1911-10-01	94.0000
1912-01-01	94.9000
1912-04-01	96.6000
1912-07-01	97.0000
1912-10-01	93.6000
1913-01-01	92.7000
1913-04-01	95.7000
1913-07-01	95.7000
1913-10-01	92.7000
1914-01-01	90.8000
1914-04-01	93.1000
1914-07-01	91.5000
1914-10-01	85.1000
1915-01-01	87.2000
1915-04-01	92.4000
1915-07-01	96.4000
1915-10-01	96.0000
1916-01-01	96.1000
1916-04-01	98.7000
1916-07-01	98.1000
1916-10-01	97.3000
1917-01-01	96.3000
1917-04-01	96.5000
1917-07-01	97.3000
1917-10-01	96.5000
1918-01-01	97.0000
1918-04-01	99.0000
1918-07-01	98.9000
1918-10-01	94.7000
1919-01-01	88.8000
1919-04-01	97.3000
1919-07-01	97.5000
1919-10-01	96.2000
1920-01-01	96.6000
1920-04-01	85.8000
1920-07-01	83.9000
1920-10-01	71.3000
1921-01-01	78.2000
1921-04-01	80.1000
1921-07-01	81.2000
1921-10-01	76.6000
1922-01-01	81.2000
1922-04-01	87.8000
1922-07-01	96.5000
1922-10-01	91.3000