| Year | Heidelberg | Heidelberg (MS) |
|---|---|---|
| 2026 | 3,358 | — |
| 2025 | 5,429 | — |
| 2024 | 2,451 | — |
| 2023 | 876 | — |
| 2022 | 572 | — |
| 2021 | 490 | 0 |
| 2020 | 512 | 0 |
| 2019 | 2,807 | 0 |
| 2018 | 3,587 | 0 |
| 2017 | 2,150 | 0 |
| 2016 | 5,957 | 0 |
| 2015 | 4,914 | 0 |
| 2014 | 7,752 | 0 |
| 2013 | 6,006 | 0 |
| 2012 | 8,196 | 0 |
| 2011 | 6,445 | 0 |
| 2010 | 7,961 | — |
| 2009 | 8,229 | — |
| 2008 | 7,166 | — |
| 2007 | 5,821 | — |
| 2006 | 9,461 | — |
| 2005 | 10,509 | — |
| 2004 | 2,872 | — |
| 2003 | 1,066 | — |
| 2002 | 480 | — |
| 2001 | 1,327 | — |
| 2000 | 14 | — |
| 1998 | 449 | — |
| 1997 | 85,050 | — |
| 1996 | 107,555 | — |
| 1995 | 141,725 | — |
| 1994 | 160,312 | — |
| 1993 | 173,647 | — |
| 1992 | 222,265 | — |
| 1991 | 265,177 | — |
| 1990 | 381,780 | — |
| 1989 | 183,384 | — |
| 1987 | 68,084 | — |
| 1983 | 176 | — |
| 1981 | 97,493 | — |