1970

7.1

2003

5.9

2005

5.3

2007

4.0

1986

6.1

2017

6.9

2002

6.8

1988

6.3

1996

6.4

2001

7.3

1964

7.1

1994

7.5

1997

6.0

2014

6.7

2017

5.0

2003

5.3

2007

3.0

2010

3.9

1996

6.4

2022

1.0