Month	Number Of Furnaces
1921-01-01	242.000
1921-02-01	193.000
1921-03-01	109.000
1921-04-01	11.0000
1921-05-01	2.00000
1921-06-01	1.00000
1921-07-01	15.0000
1921-08-01	47.0000
1921-09-01	68.0000
1921-10-01	82.0000
1921-11-01	85.0000
1921-12-01	77.0000
1922-01-01	90.0000
1922-02-01	101.000
1922-03-01	107.000
1922-04-01	112.000
1922-05-01	110.000
1922-06-01	115.000
1922-07-01	117.000
1922-08-01	126.000
1922-09-01	139.000
1922-10-01	151.000
1922-11-01	162.000
1922-12-01	169.000
1923-01-01	183.000
1923-02-01	189.000
1923-03-01	202.000
1923-04-01	216.000
1923-05-01	223.000
1923-06-01	222.000
1923-07-01	206.000
1923-08-01	196.000
1923-09-01	190.000
1923-10-01	189.000
1923-11-01	199.000
1923-12-01	204.000
1924-01-01	190.000
1924-02-01	202.000
1924-03-01	194.000
1924-04-01	194.000
1924-05-01	191.000
1924-06-01	185.000
1924-07-01	175.000
1924-08-01	173.000
1924-09-01	170.000
1924-10-01	171.000
1924-11-01	173.000
1924-12-01	167.000
1925-01-01	172.000
1925-02-01	165.000
1925-03-01	169.000
1925-04-01	158.000
1925-05-01	157.000
1925-06-01	148.000
1925-07-01	136.000
1925-08-01	136.000
1925-09-01	129.000
1925-10-01	136.000
1925-11-01	141.000
1925-12-01	141.000
1926-01-01	144.000
1926-02-01	146.000
1926-03-01	151.000
1926-04-01	147.000
1926-05-01	23.0000
1926-06-01	11.0000
1926-07-01	7.00000
1926-08-01	6.00000
1926-09-01	5.00000
1926-10-01	5.00000
1926-11-01	7.00000
1926-12-01	78.0000
1927-01-01	152.000
1927-02-01	166.000
1927-03-01	178.000
1927-04-01	189.000
1927-05-01	184.000
1927-06-01	176.000
1927-07-01	174.000
1927-08-01	165.000
1927-09-01	160.000
1927-10-01	162.000
1927-11-01	155.000
1927-12-01	149.000
1928-01-01	148.000
1928-02-01	148.000
1928-03-01	150.000
1928-04-01	149.000
1928-05-01	148.000
1928-06-01	141.000
1928-07-01	131.000
1928-08-01	130.000
1928-09-01	131.000
1928-10-01	136.000
1928-11-01	135.000
1928-12-01	132.000
1929-01-01	139.000
1929-02-01	140.000
1929-03-01	145.000
1929-04-01	152.000
1929-05-01	159.000
1929-06-01	165.000
1929-07-01	167.000
1929-08-01	170.000
1929-09-01	168.000
1929-10-01	166.000
1929-11-01	163.000
1929-12-01	162.000
1930-01-01	159.000
1930-02-01	162.000
1930-03-01	157.000
1930-04-01	151.000
1930-05-01	141.000
1930-06-01	133.000
1930-07-01	105.000
1930-08-01	104.000
1930-09-01	104.000
1930-10-01	96.0000
1930-11-01	92.0000
1930-12-01	76.0000
1931-01-01	83.0000
1931-02-01	81.0000
1931-03-01	81.0000
1931-04-01	78.0000
1931-05-01	80.0000
1931-06-01	76.0000
1931-07-01	70.0000
1931-08-01	64.0000
1931-09-01	62.0000
1931-10-01	66.0000
1931-11-01	70.0000
1931-12-01	70.0000
1932-01-01	76.0000
1932-02-01	71.0000
1932-03-01	72.0000
1932-04-01	69.0000
1932-05-01	69.0000
1932-06-01	69.0000
1932-07-01	56.0000
1932-08-01	57.0000
1932-09-01	59.0000
1932-10-01	59.0000
1932-11-01	59.0000
1932-12-01	60.0000
1933-01-01	62.0000
1933-02-01	63.0000
1933-03-01	70.0000
1933-04-01	69.0000
1933-05-01	72.0000
1933-06-01	72.0000
1933-07-01	69.0000
1933-08-01	73.0000
1933-09-01	74.0000
1933-10-01	74.0000
1933-11-01	79.0000
1933-12-01	81.0000
1934-01-01	85.0000
1934-02-01	90.0000
1934-03-01	95.0000
1934-04-01	98.0000
1934-05-01	101.000
1934-06-01	100.000
1934-07-01	99.0000
1934-08-01	97.0000
1934-09-01	98.0000
1934-10-01	97.0000
1934-11-01	96.0000
1934-12-01	96.0000
1935-01-01	94.0000
1935-02-01	97.0000
1935-03-01	98.0000
1935-04-01	96.0000
1935-05-01	97.0000
1935-06-01	97.0000
1935-07-01	98.0000
1935-08-01	98.0000
1935-09-01	97.0000
1935-10-01	99.0000
1935-11-01	102.000
1935-12-01	102.000
1936-01-01	109.000
1936-02-01	109.000
1936-03-01	109.000
1936-04-01	112.000
1936-05-01	112.000
1936-06-01	112.000
1936-07-01	110.000
1936-08-01	109.000
1936-09-01	111.000
1936-10-01	113.000
1936-11-01	114.000
1936-12-01	110.000
1937-01-01	114.000
1937-02-01	115.000
1937-03-01	117.000
1937-04-01	121.000
1937-05-01	122.000
1937-06-01	126.000
1937-07-01	126.000
1937-08-01	131.000
1937-09-01	132.000
1937-10-01	133.000
1937-11-01	135.000
1937-12-01	133.000
1938-01-01	130.000
1938-02-01	124.000
1938-03-01	118.000
1938-04-01	111.000
1938-05-01	105.000
1938-06-01	97.0000
1938-07-01	90.0000
1938-08-01	81.0000
1938-09-01	77.0000
1938-10-01	76.0000
1938-11-01	79.0000
1938-12-01	78.0000
1939-01-01	83.0000
1939-02-01	88.0000
1939-03-01	95.0000
1939-04-01	100.000
1939-05-01	113.000
1939-06-01	114.000
1939-07-01	115.000
1939-08-01	118.000