Naturally occurring isotopes:

Isotopes Atomic mass Natural Abundance (%)
180W 179.946701 0.12 (3)
182W 181.948202 26.3 (2)
183W 182.950220 14.28 (5)
184W 183.950928 30.7 (2)
186W 185.954357 28.6 (2)

                                      Isotopic abundances of W

                                      source: Mark Winter

In the above picture, the most intense ion is set to 100% since this corresponds best to the output from a mass spectrometer. This is not to be confused with the relative percentage isotope abundance which total 100% for all the naturally occurring isotopes.

All information from Web-Elements