[INST] Here is a database schema:
atom :
atom_id [ TEXT ] primary_key
molecule_id [ TEXT ] atom.molecule_id = molecule.molecule_id
element [ TEXT ]

bond :
bond_id [ TEXT ] primary_key
molecule_id [ TEXT ] bond.molecule_id = molecule.molecule_id
bond_type [ TEXT ]

connected :
atom_id [ TEXT ] connected.atom_id = atom.atom_id
atom_id2 [ TEXT ] connected.atom_id2 = atom.atom_id
bond_id [ TEXT ] connected.bond_id = bond.bond_id

molecule :
molecule_id [ TEXT ] primary_key
label [ TEXT ]

Please write me a SQL statement that answers the following question: How much of the hydrogen in molecule TR206 is accounted for? Please provide your answer in percentage. [/INST]
SELECT CAST(COUNT(CASE WHEN T.element = 'h' THEN T.atom_id ELSE NULL END) AS REAL) * 100 / COUNT(T.atom_id) FROM atom AS T WHERE T.molecule_id = 'TR206';