DuPage County Statistics
 Average  Median  # Years  High Count  Low Count


All Years  72.6  63  25  163 (1994)  32 (2010)


1st 10 Years  102.1  95.5  10  163 (1994)  63 (1999)


Last 10 Years  53.2  53.5  10  68 (2008)  32 (2010)


Likelihood that the numbers counted have decreased: 99%^{*}.
Fermilab Site Statistics
 Average  Median  # Years  High Count  Low Count


All Years  3.8  3  15  10 (2014)  0 (2008)


1st 10 Years  2.6  2  9  7 (1997)  0 (2002)


Last 10 Years  4.7  4.5  8  10 (2014)  0 (2008)


Likelihood that the numbers counted have increased: 58%^{*}.
Likelihood that occurrence rate has
decreased: 18%^{**}
^{*}
The probability is obtained from a "Wilcoxon twosample test" comparing the numbers reorded in the first 10 years with those recorded in the last 10 years.
^{**}
Assuming the observation rate is uniform, this number is the probability of obtaining a smaller difference between the number of records in the first and last 10 years of the count than is observed. A high probability implies that the assumption is wrong.
DuPage County Data
Year  Tally  Year  Tally  Year  Tally  Year  Tally


1990  143  1991  67  1992  96  1993  92

1994  163  1995  119  1996  95  1997  104

1998  79  1999  63  2000  63  2001  43

2002  62  2003  45  2004  51  2005  51

2006  66  2007  52  2008  68  2009  55

2010  32  2011  42  2012  48  2013  63

2014  55

Fermilab Site Data
Year  Tally  Year  Tally  Year  Tally  Year  Tally


1990    1991    1992    1993  

1994    1995    1996    1997  7

1998  2  1999  1  2000  2  2001  2

2002  0  2003  3  2004  2  2005  2

2006  3  2007  0  2008  0  2009  1

2010  6  2011  5  2012  4  2013  7

2014  10
