1982

4.9

2009

5.8

2003

2.9

2019

7.3

1999

3.4

2000

4.9

1974

6.0

2000

4.2

2017

6.1

1992

6.3

1969

4.1

1986

4.8

1993

6.3

2002

5.3

1999

4.3

1996

4.6

1997

4.7

1999

5.2

1970

4.2

2005

3.7