1960–1971[]
1971–1973[]
SVG NEEDED |
1973–1983[]
1973–1976[]
1976–1983[]
SVG NEEDED |
1983–1988[]
SVG NEEDED |
1988–2016[]
1988–2012[]
SVG NEEDED |
2012–2016[]
SVG NEEDED |
In 2012, the text XEWT has changed.
2016–2018[]
SVG NEEDED |
2018–present[]
SVG NEEDED |