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:
| Player | Nationality | Jersey Number(s) | Position | Years |
| --- | --- | --- | --- | --- |
| James Bailey Category:Articles with hCards | United States | 20 | PF / Center | 1979 – 1981 |
| Vin Baker Category:Articles with hCards | United States | 42 | PF | 1997 – 2002 |
| Greg Ballard Category:Articles with hCards | United States | 42 | PF | 1988–1989 |
| Mike Bantom Category:Articles with hCards | United States | 40 | PF / C | 1975 – 1977 |
| Norton Barnhill Category:Articles with hCards | United States | 10 | G | 1976–1977 |
| Dana Barros Category:Articles with hCards | United States | 3, 11 | PG | 1989 – 1993 |
| Brent Barry Category:Articles with hCards | United States | 31 | SG | 1999 – 2004 |
| Drew Barry Category:Articles with hCards | United States | 12 | SG | 1999 |
| Butch Beard Category:Articles with hCards | United States | 21 | SG | 1972–1973 |
| Benoit Benjamin Category:Articles with hCards | United States | 00 | C | 1990 – 1993 |
| Tom Black Category:Articles with hCards | United States | 12 | C | 1970–1971 |
| Cory Blackwell Category:Articles with hCards | United States | 30 | SF | 1984–1985 |
| Calvin Booth Category:Articles with hCards | United States | 52 | C | 2001 – 2004 |
| Bob Boozer Category:Articles with hCards | United States | 20 | PF | 1969–1970 |
| Lazaro Borrell Category:Articles with hCards | Cuba | 11 | PF | 1999–2000 |
| Charles Bradley Category:Articles with hCards | United States | 30 | SG | 1983 |
| Frank Brickowski Category:Articles with hCards | United States | 33, 34 | PF / C | 1984 – 1986 1995–1996 |
| John Brisker Category:Articles with hCards | United States | 40, 42 | SF - SG | 1972 – 1975 |
| ^ Fred Brown Category:Articles with hCards | United States | 32 | PG / SG | 1971 – 1984 |
| Tony Brown Category:Articles with hCards | United States | 21 | SF - SG | 1992 |
| Rick Brunson Category:Articles with hCards | United States | 5 | PG | 2005–2006 |
| Tommy Burleson Category:Articles with hCards | United States | 16 | C | 1974 – 1977 |
Question:
What is Years, when Jersey Number(s) is 21, and when Position is SG?
Answer:
1972–1973