1995

7.7

1994

7.5

2003

7.4

2001

8.1

1986

4.0

1981

6.7

2002

8.2

1983

5.2

2014

2.0

1999

7.7

1987

7.1

1999

7.0

6.3

2015

6.9

2006

5.7

2000

6.2

2002

7.4

1993

7.4

2015

0.0

2006

7.1