1979

4.2

1991

5.3

1997

7.6

2009

6.1

2021

6.2

2015

6.4

1990

5.9

2005

9.9

2002

5.2

1997

6.2

1931

5.8

2010

5.2

2016

6.5

2012

6.0

2024

9.9

2007

5.8

2002

6.7

1994

6.6

1975

4.5