The fourth plans were carried out between 1977 and 1981.
Work on the building was carried out between 1738 and 1755.
The poll was carried out between May 10 and 22.
A major rebuilding was carried out between 1908 and 1909.
All the construction works were carried out between 1667 and 1694.
Three national surveys were carried out between 1970 and 1981.
More internal work was carried out between 1973 and 1974.
This was carried out for ten months, between 1790 and 1791.
Construction was carried out throughout the war, particularly between 1941 and 1945.
Some conservation work on the site was carried out between 1977 and 1992.
