document.write('<option></option>');
document.write('<option value=../1198/13571.htm>1973 -  N173  </option>');
document.write('<option value=../1198/13572.htm>1974 -  N174  </option>');
document.write('<option value=../1198/13573.htm>1975 -  N175  </option>');
document.write('<option value=../1198/13607.htm>1976 -  N176  </option>');
document.write('<option value=../1198/13623.htm>1977 -  N177  </option>');
document.write('<option value=../1198/13645.htm>1979 -  N179  </option>');
document.write('<option value=../1198/13656.htm>1980 -  N180  </option>');
document.write('<option value=../1198/13674.htm>1981 -  N180B  </option>');
document.write('<option value=../1198/13691.htm>1982 -  N181  </option>');