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:
| Year | Party Affiliation | Winner | Number of Votes | Party Affiliation | Loser | Number of Votes | Percentage of Votes |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1920 | Republican | William F. Kopp | 38,100 | Democrat | E.W. McManus | 20,977 | 64% - 36% |
| 1922 | Republican | William F. Kopp | 26,651 | Democrat | John M. Lindley | 14,056 | 65% - 34% |
| 1924 | Republican | William F. Kopp | 42,711 | Democrat | James M. Bell | 17,110 | 71% - 29% |
| 1926 | Republican | William F. Kopp | 27,358 | Democrat | James M. Bell | 11,408 | 71% - 29% |
| 1928 | Republican | William F. Kopp | 45,806 | N/A | No Opponent | N/A | 100% - 0% |
| 1930 | Republican | William F. Kopp | 27,053 | Democrat | Max A. Conrad | 15,538 | 63% - 36% |
| 1932 | Democrat | Edward C. Eicher | 55,378 | Republican | William F. Kopp | 46,738 | 54% - 46% |
| 1934 | Democrat | Edward C. Eicher | 48,544 | Republican | E. R. Hicklin | 39,047 | 55% - 44% |
| 1936 | Democrat | Edward C. Eicher | 55,721 | Republican | John N. Calhoun | 53,474 | 51% - 49% |
| 1938 | Republican | Thomas E. Martin | 46,636 | Democrat | James P. Gaffney | 33,765 | 58% - 42% |
| 1940 | Republican | Thomas E. Martin | 70,120 | Democrat | Mrs. Zoe S. Nabers | 46,040 | 60% - 40% |
| 1942 | Republican | Thomas E. Martin | 55,139 | Democrat | Vern W. Nall | 32,893 | 61% - 37% |
| 1944 | Republican | Thomas E. Martin | 72,729 | Democrat | Clair A. Williams | 60,048 | 55% - 45% |
| 1946 | Republican | Thomas E. Martin | 52,488 | Democrat | Clair A. Williams | 32,849 | 62% - 38% |
| 1948 | Republican | Thomas E. Martin | 70,959 | Democrat | James D. France | 60,860 | 53% - 46% |
| 1950 | Republican | Thomas E. Martin | 70,058 | Democrat | James D. France | 43,140 | 62% - 38% |
| 1952 | Republican | Thomas E. Martin | 105,526 | Democrat | Clair A. Williams | 62,011 | 63% - 37% |
| 1954 | Republican | Fred Schwengel | 67,128 | Democrat | John O'Connor | 50,577 | 57% - 43% |
| 1956 | Republican | Fred Schwengel | 94,223 | Democrat | Ronald O. Bramhall | 68,287 | 58% - 42% |
| 1958 | Republican | Fred Schwengel | 59,577 | Democrat | Thomas J. Dailey | 51,996 | 53% - 47% |
| 1960 | Republican | Fred Schwengel | 104,737 | Democrat | Walter J. Guenther | 67,287 | 61% - 39% |
| 1962 | Republican | Fred Schwengel | 65,975 | Democrat | Harold Stephens | 42,000 | 61% - 39% |
| 1964 | Democrat | John R. Schmidhauser | 84,042 | Republican | Fred Schwengel | 80,697 | 51% - 49% |
| 1966 | Republican | Fred Schwengel | 64,795 | Democrat | John R. Schmidhauser | 60,534 | 51% - 48% |
| 1968 | Republican | Fred Schwengel | 91,419 | Democrat | John R. Schmidhauser | 81,049 | 53% - 47% |
| 1970 | Republican | Fred Schwengel | 60,270 | Democrat | Edward Mezvinsky | 59,505 | 50% - 49% |
| 1972 | Democrat | Edward Mezvinsky | 107,099 | Republican | Fred Schwengel | 91,609 | 53% - 46% |
| 1974 | Democrat | Edward Mezvinsky | 75,687 | Republican | James A. Leach | 63,540 | 54% - 46% |
| 1976 | Republican | James A. Leach | 109,694 | Democrat | Edward Mezvinsky | 101,024 | 52% - 48% |
| 1978 | Republican | James A. Leach | 79,940 | Democrat | Richard E. Meyers | 45,037 | 63% - 36% |
| 1980 | Republican | James A. Leach | 133,349 | Democrat | Jim Larew | 72,602 | 64% - 35% |
| 1982 | Republican | James A. Leach | 89,595 | Democrat | Bill Gluba | 61,734 | 59% - 41% |
| 1984 | Republican | James A. Leach | 131,182 | Democrat | Kevin Ready | 65,293 | 68% - 33% |
| 1986 | Republican | James A. Leach | 86,834 | Democrat | John R. Whitaker | 43,985 | 66% - 34% |
| 1988 | Republican | James A. Leach | 112,746 | Democrat | Bill Gluba | 71,280 | 61% - 38% |
| 1990 | Republican | James A. Leach | 90,042 | Scattering | Scattering | 151 | 99% - 1% |
| 1992 | Republican | James A. Leach | 178,042 | Democrat | Jan J. Zonneveld | 81,600 | 68% - 31% |
| 1994 | Republican | James A. Leach | 110,448 | Democrat | Glen Winekauf | 69,461 | 60% - 38% |
| 1996 | Republican | James A. Leach | 129,242 | Democrat | Bob Rush | 111,595 | 53% - 46% |
| 1998 | Republican | James A. Leach | 106,419 | Democrat | Bob Rush | 79,529 | 57% - 42% |
| 2000 | Republican | James A. Leach | 164,972 | Democrat | Bob Simpson | 96,283 | 62% - 36% |
| 2002 | Republican | Jim Nussle | 112,280 | Democrat | Ann Hutchinson | 83,779 | 57% - 43% |
| 2004 | Republican | Jim Nussle | 159,993 | Democrat | Bill Gluba | 125,490 | 55% - 44% |
| 2006 | Democrat | Bruce Braley | 113,724 | Republican | Mike Whalen | 89,471 | 56% - 44% |
| 2008 | Democrat | Bruce Braley | 178,229 | Republican | David Hartsuch | 99,447 | 64% - 35% |
| 2010 | Democrat | Bruce Braley | 103,931 | Republican | Ben Lange | 99,976 | 49% - 48% |
Question:
how long did james leach hold his seat?
Answer:
13 years