Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | Location | City | Listing date |
| --- | --- | --- | --- |
| Branch County Courthouse Informational Site | 31 Division Street | Coldwater | March 16, 1989 |
| Bronson Public Library | 207 Matteson Street | Bronson | September 28, 2000 |
| Chicago Road Informational Designation | US-12 and Prairie River Road (Park 1.5 miles west of Bronson) | Bronson Township | September 17, 1957 |
| City of Coldwater Informational Designation | City Park at intersection of US-12 and US-27 | Coldwater | April 14, 1961 |
| Edwin R. Clarke Library (Michigan Library Association) | 12 East Chicago Street, between Division and Hudson streets | Coldwater | March 9, 1966 |
| Dr. Hawley Harvey Crippen Home Site Informational Designation | 66 North Monroe Street | Coldwater | August 21, 1987 |
| East Chicago Street Historic District† | Chicago Street from Wright to Division streets, including the four parks at Division | Coldwater | July 26, 1974 |
| First Presbyterian Church† | 52 Marshall Street, NE corner of Marshall and Church streets | Coldwater | June 15, 1979 |
| Abram C. Fisk House† | 867 East Chicago Street | Coldwater | June 15, 1979 |
| William P. Hurd House | 601 North Broadway | Union City | July 17, 1981 |
| Lanphere-Pratt House | 90 Division Street | Coldwater | February 23, 1978 |
| Henry A. Locke House | 140 East Division Street | Sherwood | March 19, 1980 |
| Governor Cyrus Gray Luce Homesite Informational Site | Northeast corner of Division and East Washington streets | Coldwater | August 15, 1975 |
| Methodist Episcopal Church | 126 Marshall Road | Coldwater | April 17, 1997 |
| General John G. Parkhurst House | 55 North Clay Street | Coldwater | June 15, 1979 |
| Harriet Quimby Informational Designation | Branch County Memorial Airport | Coldwater | January 21, 1988 |
| Quincy Township Public Library | 11 North Main Street, just north of US-12 | Quincy | April 25, 1988 |
| State Public School at Coldwater | 620 Marshall Road | Coldwater | May 13, 1981 |
| Tibbits Opera House | 14 South Hanchett Street | Coldwater | December 11, 1970 |
| Union City Iron Furnace | M-60 near Waterworks Road | Union Township | February 14, 1963 |
| Union City Methodist Episcopal Church | 200 Ellen Street | Union City | September 19, 1991 |
| Lucius M. Wing House† | 27 South Jefferson Street, NE corner of S. Jefferson and East Pearl Street | Coldwater | October 17, 1974 |
| John D. Zimmerman House | 119 East High Street | Union City | September 21, 1983 |
Question:
how many sites were listed as historical before 1980?
Answer:
12