1992

6.7

1986

6.1

2006

5.2

1981

6.2

1982

5.9

1984

6.1

1985

5.3

1986

7.0

2001

4.8

1976

7.6

1962

7.4

2018

7.1

2000

6.3

2002

6.2

2021

0.0

2004

6.4

2006

4.9

1983

6.5

2006

6.1

2014

6.6