← All namesPiper
Raw counts
| Year | Count |
|---|
| 1952 | 5 |
| 1955 | 10 |
| 1958 | 6 |
| 1960 | 12 |
| 1964 | 11 |
| 1965 | 5 |
| 1967 | 11 |
| 1968 | 23 |
| 1969 | 5 |
| 1970 | 13 |
| 1971 | 15 |
| 1972 | 15 |
| 1973 | 12 |
| 1974 | 6 |
| 1975 | 15 |
| 1976 | 10 |
| 1977 | 33 |
| 1978 | 18 |
| 1979 | 11 |
| 1980 | 27 |
| 1981 | 5 |
| 1982 | 5 |
| 1983 | 15 |
| 1985 | 5 |
| 1986 | 5 |
| 1988 | 5 |
| 1989 | 7 |
| 1990 | 6 |
| 1991 | 7 |
| 1993 | 22 |
| 1994 | 20 |
| 1995 | 24 |
| 1996 | 82 |
| 1997 | 126 |
| 1998 | 133 |
| 1999 | 255 |
| 2000 | 484 |
| 2001 | 695 |
| 2002 | 623 |
| 2003 | 977 |
| 2004 | 1,569 |
| 2004 | 10 |
| 2005 | 1,691 |
| 2006 | 1,779 |
| 2007 | 1,914 |
| 2008 | 2,444 |
| 2009 | 2,582 |
| 2010 | 2,545 |
| 2011 | 3,548 |
| 2012 | 3,922 |
| 2013 | 3,809 |
| 2014 | 4,461 |
| 2015 | 5,286 |
| 2016 | 5,033 |
| 2017 | 4,536 |
| 2018 | 3,882 |
| 2019 | 3,859 |
| 2020 | 3,390 |
| 2021 | 3,413 |
| 2022 | 3,302 |
| 2023 | 2,639 |
| 2024 | 2,372 |