1988

6.3

1994

5.8

1996

5.7

2002

6.4

1996

7.8

1995

7.0

1999

4.5

1987

7.1

1955

7.3

2013

6.6

2007

6.7

2005

7.5

1972

7.5

1994

6.1

1987

6.0

2007

5.2

1989

6.6

2020

3.4

2016

0.0

2001

5.9