Continuous years in power as head of state or government

Continuous years in power as head of state or government:

Putin: 18
Erdogan: 15
Merkel: 13
Netanyahu: 9
Xi Jinping: 5
Abe: 5
Modi: 4
Widodo: 3.5
Salman: 3
Trudeau: 2.5
Turnbull: 2.5
May: 1.5
Temer: 1.5
Trump: 1
Macron: 1