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:
| Alumni Chapters and Clubs | Location | Founding Date | Years Active | Province |
| --- | --- | --- | --- | --- |
| Zeta Alpha | Detroit, MI | 1925 |  | Beta |
| Zeta Beta * | Columbus, OH | December 14, 1926 |  | Alpha North |
| Zeta Gamma | Cincinnati, OH | December 14, 1926 |  | Alpha South |
| Zeta Delta | Milwaukee, WI | February 7, 1927 | 1927–present | Mu |
| Zeta Epsilon * | Chicago, IL | May 21, 1928 |  |  |
| Zeta Zeta | Denver, CO | November 23, 1940 |  | Gamma |
| Zeta Eta | Bloomington-Normal, IL | December 13, 1941 |  | Delta |
| Zeta Theta * | Los Angeles, CA | 1943 |  |  |
| Zeta Iota * | Louisville, KY | 1944 | ?-2013 | Alpha South |
| Zeta Kappa * | Cincinnati, OH | May 16, 1946 |  |  |
| Zeta Lambda * | Baton Rouge, LA | 1946 |  |  |
| Zeta Mu * | Lincoln, NE | February 22, 1947 |  |  |
| Zeta Nu * | Ann Arbor, MI | December 1948 |  |  |
| Zeta Xi * | Oakland County, MI | July 7, 1953 |  |  |
| Zeta Omicron | Akron-Kent, OH | May 27, 1956 | 1956–present | Alpha North |
| Zeta Pi * | Columbia, SC | December 7, 1958 |  |  |
| Zeta Rho * | Kearney, NE | March 7, 1959 |  |  |
| Zeta Sigma | Cleveland, OH | May 15, 1960 |  | Alpha North |
| Zeta Tau * | St. Petersburg, FL | December 10, 1960 |  |  |
| Zeta Upsilon * | Washington, D.C. | December 18, 1961 |  |  |
| Zeta Phi * | Beaumont, TX | March 25, 1962 |  |  |
| Zeta Chi | Dayton, OH | February 14, 1967 | 1967–present | Alpha South |
| Zeta Psi * | Philadelphia, PA | June 4, 1967 |  |  |
| Zeta Omega * | Spartanburg-Greenville, SC | April 12, 1969 |  |  |
| Eta Alpha * | Pueblo, CO | May 25, 1969 |  |  |
| Eta Beta * | Brownwood, TX | November 14, 1969 |  |  |
| Eta Gamma * | Ft. Collins, Co | March 7, 1970 |  |  |
| Eta Delta * | San Antonio, TX | February 20, 1971 |  |  |
| Eta Epsilon * | Atlanta, GA | February 23, 1971 |  |  |
| Eta Zeta * | Buffalo, NY | May 2, 1971 |  |  |
| Eta Eta * | Jacksonville, AL | May 13, 1972 |  |  |
| Eta Theta * | Dallas, TX | November 9, 1975 |  |  |
| Eta Iota * | Huntsville, AL | September 24, 1978 |  |  |
| Eta Kappa * | Phoenix, AZ | January 26, 1980 |  |  |
| Eta Lambda * | Lithonia, GA | May 18, 2003 | 2004–2011 | Iota |
| Eta Mu * | Atlanta, GA | July 18, 2004 | 2004-2011 | Iota |
| Champaign-Urbana Alumni Club | Chambaign-Urbana, IL |  |  | Delta |
| Lincoln Alumni Club | Lincoln, NE |  |  | Theta |
| Kearney Alumni Club | Kearney, NE |  |  | Theta |
| Georgia Alumni Club * | Decatur, GA |  | ?-2012 | Iota |
| Frostburg Alumni Club | Frostburg, MD |  |  | Lambda |
| Cincinnati Alumni Club * | Cincinnati, OH |  | ?-2010 | Eta South |
| Atlanta Alumni Club * | Atlanta, GA |  | ?-2012 | Iota |
| Middle Tennessee Alumni Club | Murfreesboro, TN | 2013 | 2013-present | Zeta West |
Question:
how many chapters or clubs were founded in or before 1950?
Answer:
13