1989

7.8

1982

6.4

1990

7.5

1955

7.3

2001

6.8

1961

7.5

2004

6.3

2005

2.5

2014

7.3

1987

6.5

1994

6.8

1973

7.4

1992

6.8

2018

5.3

2005

6.6

2004

7.3

2007

6.3

2021

5.5

2012

6.1

2016

4.5