Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Athlete | Nation | Olympics | Gold | Silver | Bronze | Total |
| --- | --- | --- | --- | --- | --- | --- |
| Gillis Grafström | Sweden (SWE) | 1920–1932 | 3 | 1 | 0 | 4 |
| Evgeni Plushenko | Russia (RUS) | 2002–2014 | 2 | 2 | 0 | 4 |
| Sonja Henie | Norway (NOR) | 1928–1936 | 3 | 0 | 0 | 3 |
| Irina Rodnina / Alexander Zaitsev | Soviet Union (URS) | 1972–1980 | 3 | 0 | 0 | 3 |
| Artur Dmitriev / Natalia Mishkutenok | Unified Team (EUN)\n Russia (RUS) | 1992–1998 | 2 | 1 | 0 | 3 |
| Andrée Brunet / Pierre Brunet | France (FRA) | 1924–1932 | 2 | 0 | 1 | 3 |
| Ludmila Belousova / Oleg Protopopov | Soviet Union (URS) | 1964–1968 | 2 | 0 | 0 | 2 |
| Dick Button | United States (USA) | 1948–1952 | 2 | 0 | 0 | 2 |
| Ekaterina Gordeeva / Sergei Grinkov | Soviet Union (URS)\n Russia (RUS) | 1988, 1994 | 2 | 0 | 0 | 2 |
| Oksana Grishuk / Evgeny Platov | Russia (RUS) | 1994–1998 | 2 | 0 | 0 | 2 |
| Karl Schäfer | Austria (AUT) | 1928–1936 | 2 | 0 | 0 | 2 |
| Tatiana Volosozhar / Maxim Trankov | Russia (RUS) | 2014 | 2 | 0 | 0 | 2 |
| Katarina Witt | East Germany (GDR) | 1984–1988 | 2 | 0 | 0 | 2 |
| Tessa Virtue / Scott Moir | Canada (CAN) | 2010-2014 | 1 | 2 | 0 | 3 |
| Meryl Davis / Charlie White | United States (USA) | 2010-2014 | 1 | 1 | 1 | 3 |
| Marina Klimova / Sergei Ponomarenko | Unified Team (EUN)\n Soviet Union (URS) | 1984–1992 | 1 | 1 | 1 | 3 |
| Tenley Albright | United States (USA) | 1952-1956 | 1 | 1 | 0 | 2 |
| Elena Berezhnaya / Anton Sikharulidze | Russia (RUS) | 1998-2002 | 1 | 1 | 0 | 2 |
| Sjoukje Dijkstra | Netherlands (NED) | 1960-1964 | 1 | 1 | 0 | 2 |
| Carol Heiss | United States (USA) | 1956-1960 | 1 | 1 | 0 | 2 |
| Ludowika Jakobsson / Walter Jakobsson | Finland (FIN) | 1920-1924 | 1 | 1 | 0 | 2 |
| Kim Yu-na | South Korea (KOR) | 2010–2014 | 1 | 1 | 0 | 2 |
| Shen Xue / Zhao Hongbo | China (CHN) | 2002–2010 | 1 | 0 | 2 | 3 |
| Jeannette Altwegg | Great Britain (GBR) | 1948-1952 | 1 | 0 | 1 | 2 |
| Marina Anissina / Gwendal Peizerat | France (FRA) | 1998-2002 | 1 | 0 | 1 | 2 |
| David Jenkins | United States (USA) | 1956-1960 | 1 | 0 | 1 | 2 |
| Viktor Petrenko | Soviet Union (URS)\n Unified Team (EUN) | 1988-1992 | 1 | 0 | 1 | 2 |
| Beatrix Loughran | United States (USA) | 1924–1932 | 0 | 2 | 1 | 3 |
| Willy Böckl | Austria (AUT) | 1924-1928 | 0 | 2 | 0 | 2 |
| Fritzi Burger | Austria (AUT) | 1928-1932 | 0 | 2 | 0 | 2 |
| Patrick Chan | Canada (CAN) | 2014 | 0 | 2 | 0 | 2 |
| Marika Kilius / Hans-Jürgen Bäumler | Unified Team of Germany (EUA) | 1960-1964 | 0 | 2 | 0 | 2 |
| Brian Orser | Canada (CAN) | 1984-1988 | 0 | 2 | 0 | 2 |
| Elvis Stojko | Canada (CAN) | 1994-1998 | 0 | 2 | 0 | 2 |
| Phyllis Johnson | Great Britain (GBR) | 1908-1920 | 0 | 1 | 1 | 2 |
| Nancy Kerrigan | United States (USA) | 1992-1994 | 0 | 1 | 1 | 2 |
| Michelle Kwan | United States (USA) | 1998-2002 | 0 | 1 | 1 | 2 |
| Irina Slutskaya | Russia (RUS) | 2002-2006 | 0 | 1 | 1 | 2 |
| Maya Usova / Alexander Zhulin | Unified Team (EUN)\n Russia (RUS) | 1992-1994 | 0 | 1 | 1 | 2 |
| Isabelle Brasseur / Lloyd Eisler | Canada (CAN) | 1992-1994 | 0 | 0 | 2 | 2 |
| Philippe Candeloro | France (FRA) | 1994-1998 | 0 | 0 | 2 | 2 |
| Manuela Groß / Uwe Kagelmann | East Germany (GDR) | 1972-1976 | 0 | 0 | 2 | 2 |
| Chen Lu | China (CHN) | 1994-1998 | 0 | 0 | 2 | 2 |
| Marianna Nagy / László Nagy | Hungary (HUN) | 1952-1956 | 0 | 0 | 2 | 2 |
| Patrick Péra | France (FRA) | 1968-1972 | 0 | 0 | 2 | 2 |
| Emília Rotter / László Szollás | Hungary (HUN) | 1932-1936 | 0 | 0 | 2 | 2 |
| Aliona Savchenko / Robin Szolkowy | Germany (GER) | 2010-2014 | 0 | 0 | 2 | 2 |
Question:
how many more silver medals did gillis grafström have compared to sonja henie?
Answer:
1