1996

7.2

1999

6.4

2010

3.6

2018

6.5

1996

5.2

2005

5.3

1976

5.7

1991

5.2

2003

4.5

1985

5.8

1986

6.1

2005

5.3

2001

5.1

1999

6.5

1987

6.9

2022

1.0

2017

5.0

1963

6.6

1969

2.3

2006

6.6