1994

6.8

2002

6.0

1991

7.7

1990

5.7

2001

6.1

2016

6.6

1989

4.7

1974

7.7

2001

6.2

1996

5.6

1990

7.1

2009

5.9

2020

5.3

2019

1.0

1952

7.3

2009

6.3

2015

6.0

2005

5.6

1995

6.5

2009

6.1