Month Percent 1875-03-01 12.2000 1875-05-01 12.5000 1875-06-01 11.7000 1875-10-01 11.9000 1875-12-01 12.1000 1876-03-01 12.1000 1876-05-01 13.0000 1876-06-01 12.7000 1876-10-01 12.1000 1876-12-01 12.7000 1877-01-01 13.2000 1877-04-01 13.2000 1877-06-01 12.9000 1877-10-01 12.9000 1877-12-01 13.7000 1878-03-01 14.1000 1878-05-01 14.7000 1878-06-01 13.7000 1878-10-01 14.0000 1878-12-01 15.1000 1879-01-01 16.1000 1879-04-01 14.8000 1879-06-01 13.6000 1879-10-01 13.2000 1879-12-01 12.9000 1880-02-01 12.4000 1880-04-01 13.2000 1880-06-01 12.9000 1880-10-01 12.2000 1880-12-01 13.0000 1881-03-01 12.4000 1881-05-01 12.8000 1881-06-01 12.0000 1881-10-01 11.2000 1881-12-01 12.0000 1882-03-01 11.4000 1882-05-01 11.8000 1882-07-01 11.4000 1882-10-01 11.2000 1882-12-01 11.8000 1883-03-01 11.3000 1883-05-01 11.5000 1883-06-01 11.3000 1883-10-01 11.2000 1883-12-01 11.9000 1884-03-01 11.6000 1884-04-01 12.3000 1884-06-01 13.1000 1884-09-01 12.9000 1884-12-01 13.0000 1885-03-01 13.5000 1885-05-01 13.7000 1885-07-01 12.8000 1885-10-01 12.9000 1885-12-01 13.0000 1886-03-01 12.7000 1886-06-01 13.5000 1886-08-01 12.6000 1886-10-01 12.6000 1886-12-01 13.2000 1887-03-01 12.4000 1887-05-01 12.5000 1887-08-01 11.9000 1887-10-01 12.2000 1887-12-01 12.6000 1888-02-01 12.5000 1888-04-01 12.4000 1888-06-01 11.9000 1888-10-01 11.9000 1888-12-01 12.1000 1889-02-01 12.0000 1889-05-01 12.0000 1889-07-01 11.9000 1889-09-01 1.10000 1889-12-01 11.5000 1890-02-01 11.6000 1890-05-01 10.9000 1890-07-01 11.0000 1890-10-01 10.9000 1890-12-01 12.0000 1891-02-01 12.2000 1891-05-01 11.8000 1891-07-01 12.0000 1891-09-01 11.5000 1891-12-01 11.5000 1892-03-01 11.1000 1892-05-01 11.4000 1892-07-01 11.2000 1892-09-01 11.0000 1892-12-01 11.3000 1893-03-01 11.2000 1893-05-01 11.6000 1893-07-01 13.5000 1893-10-01 15.3000 1893-12-01 13.7000 1894-02-01 13.4000 1894-05-01 13.3000 1894-07-01 12.9000 1894-10-01 12.3000 1894-12-01 12.5000 1895-03-01 12.6000 1895-05-01 12.6000 1895-07-01 12.4000 1895-09-01 11.5000 1895-12-01 12.1000 1896-02-01 12.4000 1896-05-01 12.5000 1896-07-01 12.3000 1896-10-01 14.2000 1896-12-01 13.5000 1897-03-01 13.4000 1897-05-01 13.0000 1897-07-01 12.5000 1897-10-01 11.9000 1897-12-01 11.9000 1898-02-01 11.4000 1898-05-01 12.4000 1898-07-01 12.1000 1898-09-01 11.2000 1898-12-01 11.3000 1899-02-01 10.6000 1899-04-01 10.7000 1899-06-01 10.3000 1899-09-01 10.1000 1899-12-01 9.50000 1900-02-01 9.80000 1900-04-01 10.5000 1900-06-01 9.90000 1900-09-01 9.40000 1900-12-01 9.80000 1901-02-01 9.40000 1901-04-01 9.30000 1901-07-01 9.20000 1901-09-01 8.70000 1901-12-01 9.00000 1902-02-01 8.70000 1902-04-01 8.80000 1902-07-01 8.80000 1902-09-01 8.10000 1902-11-01 8.40000 1903-02-01 8.50000 1903-04-01 8.60000 1903-06-01 8.60000 1903-09-01 8.50000 1903-11-01 8.50000 1904-01-01 8.60000 1904-03-01 8.30000 1904-06-01 8.70000 1904-09-01 8.10000 1904-11-01 8.30000 1905-01-01 8.80000 1905-03-01 7.90000 1905-05-01 8.10000 1905-08-01 7.90000 1905-11-01 8.20000 1906-01-01 7.90000 1906-04-01 8.00000 1906-06-01 7.70000 1906-09-01 7.60000 1906-11-01 7.70000 1907-01-01 7.50000 1907-03-01 7.60000 1907-05-01 7.60000 1907-08-01 7.80000 1907-12-01 10.0000 1908-02-01 9.70000 1908-05-01 9.30000 1908-07-01 8.80000 1908-09-01 8.60000 1908-11-01 8.50000 1909-02-01 8.50000 1909-04-01 8.60000 1909-06-01 8.30000 1909-09-01 8.00000 1909-11-01 7.90000 1910-01-01 7.90000 1910-03-01 7.90000 1910-06-01 8.00000 1910-09-01 7.80000 1910-11-01 7.90000 1911-01-01 7.90000 1911-03-01 7.70000 1911-06-01 7.90000 1911-09-01 7.60000 1911-12-01 7.70000 1912-02-01 7.40000 1912-04-01 7.50000 1912-06-01 7.50000 1912-09-01 7.30000 1912-11-01 7.30000 1913-02-01 7.40000 1913-04-01 7.40000 1913-06-01 7.50000 1913-08-01 7.20000 1913-10-01 7.40000 1914-01-01 7.80000 1914-03-01 7.30000 1914-06-01 7.40000 1914-09-01 7.60000 1914-10-01 7.20000 1915-03-01 6.20000 1915-05-01 5.70000 1915-06-01 6.20000 1915-09-01 6.00000 1915-11-01 6.00000 1915-12-01 5.80000