Month	Not Specified
1884-01-01	8.8
1884-02-01	8.9
1884-03-01	8.8
1884-04-01	8.6
1884-05-01	8.8
1884-06-01	9.1
1884-07-01	10.1
1884-08-01	9.2
1884-09-01	8.5
1884-10-01	8.2
1884-11-01	8.0
1884-12-01	7.4
1885-01-01	7.9
1885-02-01	8.7
1885-03-01	8.8
1885-04-01	8.4
1885-05-01	8.5
1885-06-01	8.7
1885-07-01	9.1
1885-08-01	8.7
1885-09-01	8.3
1885-10-01	8.4
1885-11-01	8.7
1885-12-01	9.6
1886-01-01	10.1
1886-02-01	10.4
1886-03-01	11.
1886-04-01	12.1
1886-05-01	13.0
1886-06-01	13.4
1886-07-01	13.5
1886-08-01	12.9
1886-09-01	12.7
1886-10-01	12.7
1886-11-01	12.5
1886-12-01	12.6
1887-01-01	13.3
1887-02-01	14.1
1887-03-01	14.3
1887-04-01	14.4
1887-05-01	12.6
1887-06-01	10.7
1887-07-01	11.8
1887-08-01	13.6
1887-09-01	15.0
1887-10-01	15.1
1887-11-01	14.5
1887-12-01	13.8
1888-01-01	13.4
1888-02-01	12.3
1888-03-01	12.1
1888-04-01	12.7
1888-05-01	13.5
1888-06-01	13.3
1888-07-01	13.0
1888-08-01	13.7
1888-09-01	14.1
1888-10-01	14.3
1888-11-01	14.8
1888-12-01	15.4
1889-01-01	15.7
1889-02-01	15.9
1889-03-01	15.8
1889-04-01	15.7
1889-05-01	15.4
1889-06-01	15.3
1889-07-01	15.4
1889-08-01	15.6
1889-09-01	15.8
1889-10-01	16.3
1889-11-01	16.7
1889-12-01	17.0