Table:
text: Niobium
Production
Mine production (t)[64] (USGS estimate)
Country _2000 _2001 _2002 _2003 _2004 _2005 _2006 _2007 _2008 _2009 _2010 _2011_
Australia 160 230 290 230 200 200 200 ? ? ? ? ?
Brazil 30000 22000 26000 29000 29900 35000 40000 57300 58000 58000 58000 58000
Canada 2290 3200 3410 3280 3400 3310 4167 3020 4380 4330 4420 4400
Congo D.R. ? 50 50 13 52 25 ? ? ? ? ? ?
Mozambique ? ? 5 34 130 34 29 ? ? ? ? ?
Nigeria 35 30 30 190 170 40 35 ? ? ? ? ?
Rwanda 28 120 76 22 63 63 80 ? ? ? ? ?
World 32600 25600 29900 32800 34000 38700 44500 60400 62900 62900 62900 63000

Question: According to the list of materials, what is the total amount of niobium produced in Rwanda in 2000?

Question: After Brazil, which country produced the most niobium?

Question: Which country produced 50 niobium in 2002 but only 13 in 2003?

Question: How much -lrb- t -rrb- niobium was produced in total in the world in 2000?