1998

6.4

2006

5.1

2017

4.5

2001

0.0

1997

6.3

1998

4.4

2002

5.6

1992

5.6

2013

5.0

1999

5.3

2005

5.4

1976

5.9

1986

6.9

1991

4.7

1994

4.8

2017

7.3

1984

6.2

1990

7.3

1991

8.1

2005

7.0