2007

6.1

1975

4.9

1999

6.8

2000

6.5

2001

6.9

1996

6.3

1995

5.8

2017

5.7

1990

7.0

1997

4.6

1966

6.3

2002

5.5

2003

5.0

2016

7.6

1996

6.7

1995

5.9

1994

6.2

2015

6.3

2015

5.8

2007

6.0