1988

5.1

1999

7.4

2003

5.9

1981

4.8

2019

7.3

1984

4.8

1999

6.8

1998

6.6

1993

5.5

2004

5.6

1987

7.3

2016

5.0

2002

7.2

1995

6.7

2017

6.8

2004

7.2

2006

7.0

2004

4.6

2003

6.0

2005

5.9