1974

7.1

2002

7.6

1989

6.6

2007

5.2

2007

5.4

2006

6.0

1995

6.5

2000

5.3

1986

5.6

1974

0.0

1986

3.0

2005

6.3

1999

7.4

2003

5.8

1972

7.1

2015

4.9

1997

6.6

2002

6.8

2006

7.2

1996

6.0