Thread:Eltool/@comment-28440632-20170608154349/@comment-26044830-20170620233853

4000 BC-1000 BC (100 years)

1000 BC-1000 AD (50 years)

1000 AD-1500 AD (25 years)

1500 AD-1700 AD (10 years)

1700 AD-1800 AD (5 years)

1800 AD-1900 AD (2 years)

1900 AD-present (1 year)